I can’t find my notebook, mom. _______ is it —Peter, it’s under the chair.

I have to be at the office by noon tomorrow. My co-workers are taking me out for a final good-bye lunch. — ________ Where are you going to eat? —I don’t know. They want to treat me.

下列各句中“之”字意义与用法不同于其他三项的是

When is the best time ______ China

Several companies are__________ each other__________ a contract（合约）.[ ]