1. We can use digital _______ (照相机) to take high-quality images.

5. Ann doesn’t want to move to Mars. She __________floating away into the space.

4. My parents never ____________ my lessons, for I work very hard.

3. You can easily ____________ drinking polluted water.

2. Let’s ___________ the easiest one, OK?

(begin with, worry about, be afraid of, get ill from, be different from)

1. The gravity on Earth ________________ that on Mars.

5. 未来的飞机可以用光速飞行吗？

Will the plane go ______ ______ _______ _______ light?

**6. 老师阻止孩子们跑向森林的深处。

The teacher _______ the children ______ further in the forest.

4. 植物能生产出食物和氧气。

Plants can ________ food and ___________.

3. 在火星上我们将被机器人照顾。

On Mars, we will _______　 ______　 _______ by robots.

2. 地球上的生活和火星上的生活不一样。

Life on Earth is not ________　 ______　 _______ that on Mars.