Mike and I to the zoo and some tigers there yesterday.

I turn on the TV for you，Grandpa?一Yes，thanks a lot，my dear. You’re so considerate.

He watched TV for an hour. At 8 o’clock he stopped _______ his homework.

The wreckage of something like a jet plaindiscovered in the heart of the desert is believed ______ a UFO and _______downfor reasons still mysterious.

Would you mind _______ in the classroom —Sorry, I won’t do that again.