16. If he needs any further information, ( ) him to me.
A. refuse B. refute C. refer D. reflect
17. All the roommates welcome Mary''s suggestion that they ( ) only English in their dormitory.
A. must speak B. would speak C. should speak D. had better speak
18. It was not until recently ( ) we learned the famous film star would marry that politician.
A. when B. which C. that D. then
19. The Robinsons have a large garden, ( ) they never have to buy vegetables.
A. because B. but C. that D. so
20. It was not very long ( ) scientists applied the technique to other species.
A. while B. then C. before D. after
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