There ______ a river on the farm before. （ ）

A．is

B．are

C．was

（题文）We ______ fun on Mars in my dream last night.  （ ）

A．has

B．have

C．had

Sam ________ in the sea last summer.

A．swims

B．swim

C．swam

句子改错
1. China hold the 29th Olympic Games in Beijing.
______________________________________
2. We can see skating at the Summer Olympics.
______________________________________
3. What was your favorite sports?
______________________________________
4. Telling me something about the Games.
______________________________________
5. They are stand for all people of the world.
______________________________________