You have to explain ________ you were absent from school yesterday.

Are these your keys ________ me at Cindy2013@hotmail.com.

188 He found it dull to be kept in the same class with other students, for his English was _____ above the beginners’ level

There was never any time for Kate to feel lonely,________she was an only child.[ ]

Excuse me, sir. I’m afraid you can’t smoke here. This is non-smoking area.—Oh, sorry. I ____________ the sign.