---What should I do, doctor? ---_______healthy, you should take more exercise.
A. Keep B. To keep C. Keeping D. To keep away from
There is _________ sheep _______ grass under the big tree.
A. a few; eating B. a little; eating C. few; to eat D. little; to eat
---Who helped Mum wash the dishes yesterday? ---Helen ______.
A. does B. do C. did D. was
---_______I come back before five o’clock?
---No, you ________. But you________ be back later than seven o’clock
A. Need; must; mustn’t B. May; mustn’t; can’t
C. Can; can’t; can’t D. Must; needn’t; can’
It is unhealthy _______ us to eat too much sweet food and it is wrong _______ us to buy sweet food every day.
A. of, of B. for, of C. of, for 
D. for, for
--- Can we meet at 9 o’clock tomorrow morning? ---Sorry, let’s make it _______ time.
A. others B. the other C. another D. other
