All Mrs Smith's efforts to tidy the room were _____ because her grandson soon made a mess of it again.
A. at all costs B. at random
C. in vain D. in return
___ is left over may be put into the refrigerator, ____ it will keep for two or three weeks.
A. Whoever; when B. Whenever; which
C. Whatever; where D. Whichever; while
Modern science has given clear evidence ____ smoking can lead to many diseases.
A. what B. which C. that D. where
Three young men have been arrested because they were caught ___ an old lady last night.
A. robbed B. to rob C.rob D. robbing
______ a little earlier, you could have got a copy of his latest book.
A. If you would arrive B. If you arrived
C. Should you arrive D. Had you arrived
Don't be afraid to ____ help if you have any further problems.
A. beg B. hesitate C. desire D. seek
