Thunderstorms have struck northern China, ______ heavy rain and ______ traffic chaos.
| A．brought, caused | B．bringing, causing |
| C．having brought, having caused | D．to bring, to cause |
They kept trying _________ they must have known it was hopeless.
| A．if | B．because | C．when | D．where |
There are five pairs _________, but I’m at a loss which to buy.
| A．to be chosen | B．to choose from | C．to choose | D．for choosing |
.It’s ____ so easy as you imagine.
| A．almost not | B．not nearly | C．hardly | D．not almost |
_________ going to the exhibition.
| A．All but he and me is | B．All but he and me are |
| C．All but he and I are | D．All but he and I am |
.______ I admit that there are still some problems about the traffic in this area, I don’t mean that it can’t be solved.
| A．While | B．Until | C．Unless | D．As |