Our teacher looked here and there on our playground________ looking for something.[ ]

______ I see your ID card, sir We have to check yourinformation.

With all his attention ________ on his experiment, he has no time to spend with his family.[ ]

You read the newspaper just now. Did you find ______ in it

I’ve decided to keep all these stamps as they might be ________ some day.(2012·天津联考)