阅读理解。

     Mother's Day is an important day. It's a day children can show their mothers how much they love them. On Mother's Day, many children give flowers to their mothers. This makes them very happy.

     Mrs. Green lived in a small street. She had a flower shop. People who lived near her store were poor. The children didn't have money to buy flowers. Mrs. Green helped them. The children worked one hour

for Mrs. Green. They cleaned the windows in the store. Then Mrs. Green gave them some flowers to take home for their mothers. The mothers had a nice Mother's Day. Both the mothers and children were happy.

1. On Mother's Day, children give ______to their mothers.

A. flowers

B. cards

C. foods

D. clothes

2. Mrs. Green lived in a ______street. 

A. big

B. small

C. clean

D. dark

3. The children worked one ______for Mrs. Green. 

A. hour

B. week

C. month

D. year

4. The children _____ in the store. 

A. made tea

B. washed the car

C. watered flowers

D. cleaned the windows