Mom，don’t you think it's OK to play once in a while ____________ it doesn’t affect my studies?
A．even if B．unless C．so that D．as long as
— Is everyone here?
— Not yet．Look，there ______________ the rest of our guests!
A．come B．comes C．is coming D．are coming
The boy was so tired that he fell asleep _____________ his mother could take off his clothes．
A．before B．after C．while D．where
—Why not find a new job?
—Why should I? I _____________ as much，but I like what I'm doing．
A．didn't earn B．don't earn C．hadn't earned D．haven’t earned
Advertising can influence consumers' moods，_____ in turn，can influence consumers’reactions to products．
A．that B．which C．where D．when
The scientist spent years alone in the forest，____ by eating wild fruit and small animals．
A．surviving B．survived C．to survive D．having survived
