— Is Lily good at singing?　　　—Yes , she is．We often hear her_______ in the next room．

My grandparents’ clock doesn’t work. I’m trying to find a repairman who can     for them.

Don’t______all the milk,we need some for breakfast.

The TV show__________“The Undersea World” let many people see __________ under the sea. 

 The workers in the Huashan Mountains have to       rubbish to keep the mountains clean.