Modal verb: could & couldn't

I _________ go to the party last night because I was sick.

• could

• couldn't

They ___________ go shopping last night because the mall was closed.

• could

• couldn't

I'm very tired, so I ___________ go out to the park to play with my friends.

• could

• couldn't

Most dinosaurs walked on land, but some _____________ fly and even swim!

• could

• couldn't

Alex hit the trees because he __________ stop his car. He was speeding too fast on the road.

• could

• couldn't

How many hot dogs ____________ you eat at one time?

• could

• couldn't

I __________ read without my reading glasses. Where are they?

• could

• couldn't

The clown was very brave. He __________ enter the lion's cage.

• could

• couldn't

Alia's house is too far, We _________ walk there.

• could

• couldn't

The questions were easy. Everybody _________ solved them quickly.

• could

• couldn't