The World Health Organization has given some advice on________to protect us from being infected(感染)with H7N9．
| A．how |
| B．what |
| C．where |
| D．when |
---How long ______ you ______ the bicycle? ---About two weeks.
| A．have, had | B．have, bought | C．did, buy | D．have, get |
---What delicious cakes! ---They would taste _____with butter.
| A．good | B．better | C．bad | D．worse |
Let’s go climbing if it _________ tomorrow.
| A．won’t snow | B．doesn’t snow | C．isn’t snow | D．can’t snow |
I saw him _______basketball with Jack an hour ago.
| A．plays | B．to play | C．played | D．play |
The man in the office ____be Mr. Black because he phoned me from London just now.
| A．mustn’t | B．may not | C．can’t | D．needn’t |