I work hard at school. I think I _______ a teacher someday.

The level of the river ___ 20 centimeters over the security line and ____must be taken to control the flood.

Why is e-shopping getting more popular Because it________save a lot of time if it is properly used.

The driver began to speed up to _____ for the hour he’d lost in the traffic jam.

John opened the door. There________ he had never seen before.