12.自便。You ______ _____ to come and go as you please.

11.明天才有空。I ____ ____ ____ until tomorrow.

10.了两天雪了。It ____ ____ _____ for two days.

9.听录音已经有半个小时了.We ____ _____ ______ to the tape-recording for half an hour.

8.直在写作文.He ____ ____ ______ a composition.

7.坐在这里。I _____ ____ ______ here all afternoon.

6.孩子到现在已经睡了几个小时？____ _____ hours ___ the baby ____ _____?

5.商店只剩下两双鞋了。

There_____ two _____ ______ shoes left in the shop.

4.我们应该尽力帮助老年人。

We should ____ _____ _____ to help the old.

3.顺便问一下，哪一条是去邮局的路？

____ ______ ______ ,which is the way to the post office?