动词填空。 用括号中所给动词的适当形式填空，要求语法正确，句意完整。

1. It's hard to believe that Helen can _________ (speak) Japanese so well.

2. Nowadays recorders _________ (use) by English teachers in class.

3. Thanks to their help, we _________ (finish) the work already.

4. Will you ring me up as soon as your mother_________ (get) to Beijing?

5. I _________ (put) up a map on the wall when Mr. Shute came in.

6. Listen. John is practicing _________ (sing) an English song in the room.