用所给单词的正确形式填空。

1. The joke is _______ (fun). We all laugh.

2. Where is the _______ (happy)? It's in your own hands.

3. My mother was _______ (satisfy) with what I did.

4. Don't let him _______ (go) there alone.

5. Have you finished _______ (read) the book?

6. All the students are busy _______ (clean) the room.

7. Did you hear the baby _______ (cry) in the next room?

8. Jack went to school without _______ (take) his backpack.

下列哪些因素可以推动经济增长（）

A、储备丰富的自然资源

B、效率低下的劳动生产力

C、高素质的人力资本储备

D、日益雄厚的社会资本积累