用所给动词的适当形式完成句子。

小题1:The teacher told us that the earth       (travel) around the sun.

小题2:Students in Yancheng didn’t go to school last Thursday because of the         (pollute) air.

小题3:We are not sure if humans       (move) to the Mars in the future.

小题4:By the time she left college, she_________（fall）in love with the young man.

小题5:More than one student_________(progress) a lot in English since they became Grade 9 students.

Loins from _____ are very lazy.[ ]

A. China

B. Australia

C. Africa

D. America