22. I didn' t manage to do it _____ you had explained how.
A. until B. unless C. when D. before
21. We'd better hurry ______ it is getting dark.
A. and B. but C. as D. unless
20. When you read the book, you' d better make a mark _____ you have any questions.
A. at which B. at where C. the place D. where
19. You'll miss the train ______ you hurry up.
A. unless B. as C. if D. until
18. Speak to him slowly _____ he may understand you better.
A. since B. so that C. for D. because
17. Although it's raining, _____ are still working in the field.
A. they B. but they C. and they D. so they
16. I'll stay here _____ everyone else comes back.
A. even if B. as though C. because D. until
15. We didn’t go home _____ we finished the work.
A. since B. until C. because D. though
14. She was _____ tired _____ she could not move an inch.
A. so, that B. such, that C. very, that D. so, as
13. _____ the rain stops, we' 11 set off for the station.
A. Before B. Unless C. As soon as D. Though
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