--- I hear Sam has gone to Qingdao for his holiday.
--- Oh, how nice! Do you know when he        ?

—Do you know when World Non-smoking Day is?—_____________.

    A. It’s a fine day   B. It’s May 31   C. It’s Sunday   D. It’s time to give up smoking

选择方框内所给词的适当形式填空。（注意词形变化）。（每空一词）

1.How do you study for a test? By _______ with a group.

2.Teenagers should be allowed to choose their _____ clothes.

3.What will you do in your free time? I’ll help to clean up the city _____.

4.Do you know when the _____ was invented? It was invented in 1876.

5.By the time I got outside, the bus had already _____.

—Oh, this is really an old building.
—Do you know when it        ?

—Oh, this is really an old building.

—Do you know when it        ?

A．has built          B．is built            C．was built          D．will be built