完成句子。

1. — 你曾去过大连吗?

    — Have you ______ ______ to Dalian?

    — 是的,去过.那是一个美丽的城市.

    — Yes, I ______. It's a beautiful city.

2. 我看过很多次英文电影了.

    I ______ ______ English films many times. 

3. 你曾听说过外星人吗?

    ______ you ______ ______ ______ the aliens?

4. 水族馆里有如此多的不同种类的鱼.

    There are ______ ______ different kinds of fishes in the aquarium.

5. 他们两人都不擅长运动.

    ______ ______ them is good at sports.