(  ) 2.Human beings have not discovered any life in space yet.
A. looked    B. found

C. invented    D. searched

(   ) 1. Scientists have launched many spaceships to explore other planets in the solar system.

A. sent up    B. set up

C. given up    D. got up

5. This robot has the same name as its inventor.

This robot_________  _______  _______  its inventor.

4. The young man happened to find his lost car.

The young man found his lost car           

3. His dream of being a soldier came true last year.

His dream of being a soldier           last year.

2.1 won't believe there are aliens until I see them.

I       believe there are aliens       I see them.  

1. A new kind of computer will be shown this Sunday.

A new kind of computer              this Sunday.

5. Two         (three) of the students in my school are girls.

4. Aliens        ( see) by some people.

3. This film is worth__________ ( see) a second time.