句子
The first man swim across the river will receive a prize.
The first man swim across the river will receive a prize.
Now the air pollution in this city _____ more and more serious with each passing day.
Now the air pollution in this city \_\_\_\__ more and more serious with each passing day.
It was Einstein _____ wrote and published his famous theory relativity.
It was Einstein \_\_\_\__ wrote and published his famous theory relativity.