2. We won't throw waste paper here and there.

Waste paper      here and there.

1. We plant many trees on the mountains every year.

Many trees      on the mountains every year.

5. Our space heroes can travel       space and discover something new       Mars.

4. I met one of my old friends       chance yesterday.

3. Maria feels like being a scientist        the future.

2. Astronauts        China, the United States and Russia will take part       the space flight.

 用适当的介词填空。

1. I heard the news       the radio about Shenzhou IX

dance,admire, master, realize, universe

1. Our Chinese Dream      as long as we all work harder.

2. She wants to be a      when she grows up.

3. I really       those volunteers. They are very helpful to the disabled.

4. We know little about the       There are too many things to explore.

5. You have to       at least two foreign languages for your further study.

(   ) 5. He is surfing the Internet to learn      new technologies.

A. about    B. from

C. for    D. on

(   ) 4. ―Why are you so      ？

——Because we have just seen an       film.

A.  excited;excited

B.  exciting;excited

C.  excited;exciting

D.  exciting;exciting