The present financial crisis has put the world economy in a difficult .
| A．occasion | B．case | C．background | D．situation |
It was with great joy _____ he received the news that his lost daughter had been found.
| A．because | B．which | C．since | D．that |
It is these poisonous products_____can cause the symptoms of the flu , such as headache and aching muscles .
| A．who | B．that | C．how | D．what |
—Your hometown is so beautiful!
—Yes. What's more, _ _____ we live there is fresh air there is no in town.
| A．that | B．whether | C．where | D．when |
--- Tom, how about going for a picnic this weekend?
--- _________. I love getting close to nature.
| A．I’m afraid not | B．I couldn’t agree more |
| C．It’s well done | D．I don’t think so |
I was really anxious about you. You ______ home without a word.
| A．mustn’t have left | B．shouldn’t have left |
| C．couldn’t have left | D．needn’t have left |