He has two children,______have become world-famous scientists.A．none of whoB．all of whomC．

After a child grows up, he______.A．will have little time playingB．has to be successful in

Two of the children have to sleep in one bed, but the other three have ______ ones.A．simil

Young children ______ language intuitively, without having to be taught grammar, pronuncia

I’m surprised by the sense of ________ he has with children.A easinessB easeC restD alar

－－－ __________？－－－ Two years ago.A. Where did he goB. How long has he been in AmericaC.

John______away for the last two days but he should be back tomorrow.A．isB．wentC．has beenD．