How long do you suppose it is _____ he arrived here? — No more than half a week.[ ]

There are __________ stars in space.

In our company, only a few are for the decision, but the rest ______ all against it.

“Trick or treat”means kids will play a trick you if you don’t give them a treat.

He is known _____ a scientistand famous _____ his research on rice.