If it were not for the fact that she __________ sing, I would invite her to the party.

A. couldn’t     B. shouldn’t

C. can’t   D. might not

The men got out and pushed the bus . But it ____ move , not one bit .

A . couldn''t     B . wouldn''t     C . needn''t     D . shouldn''t

When Ben Franklin was only a boy, he always wanted to know about things. He was always asking his father and brothers “What?” and “How?” and “Why?”

They couldn’t always tell him what he wanted to know.

When they couldn’t tell him, Ben tried to find out for himself.

Many times Ben did find out things that no one knew before. The other boys would say, “That Ben Franklin! He’s always finding out something new!”

Ben lived close to the water. He liked to go there to see the boats. He saw how the wind blew them across the water.

One day Ben said to himself, “Why can’t the wind help me float across the water? And I’m going to try.” Ben got his big kite. He took hold of the kite string and ran with it. The wind took the kite up into the air. Then Ben jumped into the water.

The wind blew the kite high into the air. Ben began to float across the water. Soon he was on the other side, and he had not worked at all.

One boy shouted, “Look at Ben floating across the water! His kite takes him to the other side without any work!”

“Yes,” said another. “He’s always finding new ways to do things.”

When he was only a child, Ben             .

A. liked to fly a kite by himself       B. always asked easy questions

C. always liked to play with water    D. always liked to find out how things worked

His father and brothers            .

A. couldn’t answer all his questions    B. could answer all his questions

C. tried hard to find out something new for him 

D. were too busy to answer his questions

How did Ben Franklin float across the water?

A. The other boy took him across it.      B. The water carried him across it.

C. The flying kite took him across it.      D. A boat took him across it.

He found out many things that            .

A. children didn’t know          B. his father and brothers knew

C. people didn’t know           D. most people knew

I _____ have watched that movie --- it’ll give me horrible dreams.

A. couldn’t          B. needn’t              C. shouldn’t          D. mustn’t