Those natives who _________ move from place to place with their animals in the past have moved into new houses at last.
With a lot of difficult problems_____, the newly-elected president is having a hard time.
You shouldn’t keep silent when ____
The students expected ____ more reviewing classes before the exam.
___to complete the job on time, they set out to work immediately.
My watch has stopped, so I will get it ______ this afternoon.