1. ___ we get on well with a number of people， we are usually friends with only a very few.
　　A. As B. Once
　　C. Before D. While
　　2. — How long do you think it will be ___ man can solve the problem of cancer？
　　— Well. It depends.
　　A. when B. until
　　C. after D. before
　　3. What an unforgettable experience！ I’ll write it down ___ it is still fresh in my memory.
　　A. since B. while
　　C. after D. until
　　4. — Peter told me he wanted to come with us. Is it OK for you？
　　— I don’t mind ___ he pays for his meals.
　　A. as far as B. as long as
　　C. as well as D. as soon as
　　5. The shopping mall will be constructed ___ there used to be a school many years ago.
　　A. where B. what
　　C. in which D. which
　　6. ___ you disagree with her， she’s worth listening to.
　　A. Even if B. In case
　　C. Only if D. As if
　　7. ___ we have realized the danger of this problem， some measures should be taken as soon as possible.
　　A. Now that B. As long as
　　C. In order that D. Even if
　　8. The town suffered a record of 32 accidents in July 2013， the most ___ it began publishing monthly figures in 2011.
　　A. since B. when
　　C. while D. though
　　9. — The experiment is of particular importance.
　　— I see. We will carry on with it ___ we can get enough money or not.
　　A. unless B. whether
　　C. though D. until
　　10. You can’t believe how terrible the fire is ___ you see it with your own eyes.
　　A. though B. because
　　C. unless D. since
　　11. ___ interesting the film is， I won’t waste any time on it.
　　A. No matter B. Whatever
　　C. Whichever D. However
　　12. I usually take something to read when I travel by train ___ I feel bored.
　　A. as if B. so that
　　C. in case D. even though
　　13. After retiring， he continued giving lessons in his Washington home ___ he died last week.
　　A. until B. when
　　C. since D. once
　　14. The fire went on for quite some time ___ it was brought under control.
　　A. before B. since
　　C. after D. when
　　15. You should have a good night’s sleep ___ much work you have to do.
　　A. however B. as
　　C. although D. whatever
　　16. I have never seen him， ___ I can remember， reading anything but newspapers.
　　A. as far as B. as soon as
　　C. unless D. until
　　17. ___ we gave him something to eat， he would save it up for his little sister. 　　A. Whatever B. However
　　C. Whenever D. Whichever
　　18. As you write in the story， it has been 20 years ___ I last saw you in a seaside hotel.
　　A. when B. before
　　C. after D. since
　　19. He hasn’t got any hobbies— ___ you call playing games on the computer a hobby.
　　A. If B. Unless
　　C. When D. Since
　　20. ___ the grandparents love the children， they are strict with them.
　　A. While B. As
　　C. Since D. Because
　　21. ___ the girl was too selfish and never thought of others， she wasn’t getting on well with her classmates.
　　A. Since B. Unless
　　C. Though D. Until
　　22. The cartoon Pleasant Goat and Big Big Wolf appeals so much to children ___ it is to their taste.
　　A. that B. which
　　C. because D. while
　　23. Small sailboats can easily turn over in the water ___ they are not managed carefully.
　　A. though B. before
　　C. until D. if
　　24. I used to love that film ___ I was a child， but I don’t feel it that way any more.
　　A. once B. when
　　C. since D. although
　　25. ___ you’ve got the chance， you might as well make full use of it.
　　A. Now that B. After
　　C. Although D. As soon as
　　26. — Did you remember to give Mary the money you owed her？
　　— Yes， I gave it to her ___ I saw her.
　　A. while B. the moment
　　C. suddenly D. once
　　27. I’d like to arrive 20 minutes early ___ I can have time for a cup of tea.
　　A. as soon as B. as a result
　　C. in case D. so that
　　28. Unlike watching TV， reading is a highly active process ___ it requires attention as well as memory and imagination.
　　A. until B. but
　　C. unless D. for
　　29. — Did Jack come back early last night？
　　— Yes. It was not yet eight o’clock ___ he arrived home.
　　A. before B. when
　　C. that D. until
　　30. ___ environmental damage is done， it takes many years to recover.
　　A. Even if B. If only
　　C. While D. Once