David was careless find the mistakes in his test paper.

It is a heavy stone I can't lift it up.

    Last Wednesday, Mr Chan took his class to the Space Museum. , the children watched a movie about space travel. They saw how the space shuttle(航天飞机) took off in space and later landed on Earth again. It was very exciting the children felt that they were travelling in space !

    After the Mr Chan took them to see some models of rockets and the space shuttles. The models looked very real, but they were much . The children also saw some moon stones.' Two Americans landed on the in 1969. They put an American flag there. Then they brought some stones back to the Earth.

    Before the children left, they a video show about people living and in a spacelab(太空实验室). The spacelab was very big.

I tell my students my new telephone number they may call me when necessary.

This book is interesting everyone wants to read it.

He had long arms he could almost touch his knees.

The workers did well he was pleased with them.