7. The innovations at the World's Fair were .
A. fascinating
B. fascinated
C. to fascinate
D. to be fascinated
6. He ______ a letter to his friend last night.
A. had written
B. was written
C. will write
D. wrote
5.There was a burst of laughter ______ the joke.
A. followed
B. following
C. to be followed
D. being followed
4.______ on top of the hill, the field is a green gem.
A. Seeing
B. Seen
C. saw
D. to see