— Hi, Linda. I didn’t see you at the party last night.— Oh, I ready for the math exam all the time.
– What does your brother ______? – He is of medium build.
There ______ a dolphin show in the zoo tomorrow evening.
There is _____pollution and ____fishes in the river now than 20 years ago.
The sign(标志牌)made us safe.
Everyone should play a part in _____the earth.