Those__________ my parents.

The reason _______ he felt frustrated was ______ he lost his MP4.

He _____ some French when he was on a visit to France.

It’s reported that there are more than 300 ____ smokers in China， nearly a third of all the smokers in the world.

What courses are you going to do next term?—I don’t know. But it’s about time ________ on something.