非谓语动词的恰当形式填空：

John Snow told the story about the ________(astonish)people in Broad Street．

非谓语动词的恰当形式填空：

The ________(worry)mother looked at her ________(worry)son, looking ________(worry)．

非谓语动词的恰当形式填空：

There is a car ________(park)outside the house．

非谓语动词的恰当形式填空：

Don’t drink the ________(pollute)water．

非谓语动词的恰当形式填空：

The library is ________(close)on weekends．