用所给动词的正确形式填空.

He ________ (lie) on the ground when I saw him.

用所给动词的正确形式填空.

What ________ you ________ (do)at nine o'clock last Sunday morning?

用所给动词的正确形式填空.

While it was looking at the souvenirs， the shop assistant ________ (call) the police.

用所给动词的正确形式填空.

The boy was walking down the street when a UFO ________(land)

用所给动词的正确形式填空.

While the girl was shopping，the alien ________ (get)out.

用所给动词的正确形式填空.

My son ________ (play) with the cat when I was in kitchen.

根据句意，用括号中所给单词的适当形式填空.

We are thankful to the great ________ (invent) by them.

根据句意，用括号中所给单词的适当形式填空.

The alien visited the Museum of ________ (fly).

根据句意，用括号中所给单词的适当形式填空.

The girl was ________ (scare) when she saw the dog.

根据句意，用括号中所给单词的适当形式填空.

He took the boy to the hospital ________ (safe).