（2014浙江杭州）My cousin went abroad at________age of eighteen．
A．a
B．an
C．the
D．不填
There are________many students on the playground．I can hardly find Tom．
A．so
B．such
C．very
D．pretty
He doesn’t know when he should go there．（改为同义句）
He doesn’t know________ ________go there．
（2014山东滨州）根据汉语意思和提示词翻译句子
我爸爸过去经常开车上班，现在坐公交车了。（used to do sth．）
_______________________________________________________________________________
—Excuse me．what’s this for？
—It’s a cleaner and it________to pick up dirt．
A．uses
B．is used
C．is using
D．used
We believe scientists will________a way to solve the air pollution．
A．set off
B．put off
C．come up with
D．catch up with
