Why ask me to take that earlybus— Because that bus _______ the 9:30 trainat Boston .

The world economic crisisin 2008, but the global economy began to recover in the second half of 2009.

Robert is _____ to face dangers. Don’t be worried about him.-I think so.

So difficult_____it to acquire a large vocabulary without the help of a teacher that he was close to giving up .

To be well-informed, we should be _____ communicationeach otherwhat happens to us