1 . 用which和as填空
1. By boat is the only way to get here, __________ is how we arrived.
2. __________ is known to us, nothing can be achieved without dedication and frustration.

2 . 选择合适短语并用其适当形式填空，其中一项为多余选项。

on average        make a contribution     reach out by contrast make an exception       as the saying goes

1. ________, a man depends upon his parents at home and upon his friends away from home.
2. The telephone allows us to ________ beyond our own lives.
3. David is difficult to get along with; ________, his brother is quite easygoing.
4. Everyone should ________ to protecting the environment.
5. Fine, I’ll ________ for you this time.