1. In this factory, suggestions often have to wait for months before they are fully _____.

—Will $ 2,000 _______ the cost of the trip? —I’m afraid not. Perhaps I need another $500.   

There's no bus now, and we can't get home _______ by taxi.

It was a great _____ for him to be pleasant to people he didn't like.

As is known, mobile phone make it possible for people to____each other conveniently.