If the Watergate Incident__________Nixon would not have resigned from the presidency.

Excuse me. When can we play badminton at the court —-Not until it _______ next week.

We are all aware _________ the many threats _________ the environment and we need to take action to prevent us from the bad consequences

47. She was disappointed _____ hearing thenews that Chinese football team lost the first match in “World Cup”.

－Mary, how did your Math test go－I had thought I ________, but in fact I came in the top 10 in my class.