You _______ wash your hands before meals. It is good for your health.
A. may B. can
C. have better D. should
You _______ walk across the road. It’s dangerous.
A. may not
B. don’t have to
C. mustn’t
D. needn’t
You’d better _______ too much meat. You are much too fat.
A. not eat B. eat
C. not to eat D. don’t eat
You should _______ the doctor’s advice and _______ the medicine on time.
A. follow; eat B. take; eat
C. follow; take D. eat; take
_______ necessary for us _______ our environment clean and tidy.
A. This is; keep
B. That’s; to keep
C. It’s; to keep
D. It’s; keep
She was afraid of __________SARS because it was dangerous.
A. catch B. catches
C. caught D. catching
