用place短语的适当形式填空。

1. A little gratitude would be ____.

2.I' m at a loss what to do next. What would you do (if you were )____ ?

3. Plastics have ____ manyother materials.

4.  We use plastics _____ many other materials.

5. While the manager was on holiday, he ___.

瞬时记忆保存的时间一般在（）秒以内

A．0.25

B．1

C．4

D．5