--My watch doesn't work now. Could you help me fix it?-- .
The young trees should______ as often as possible.
We prefer ________at the party to________.
---Look!It _______ be Mr Zhang . ---No,it _______ be Mr Zhang. He has gone to Paris .
Could you show me the new computer________ the other day ?
---What do you think of these two books?---_________ of them are interesting. And I’ve read them several times.