实现我国物流系统与国际物流大系统顺利接轨，关键在于物流标准化。

用所给词的适当形式填空。

1. If you work hard, you will be ___________(success).

2. Those workers spent ten months _____________(build) that bridge.

3. They often find it difficult ___________(learn ) English.

4. Pollution is one of the most serious _______ in the world (problem).

5. I had enough time_______(work) out that math problem.

6. The doctor told me to give up _______ (smoke).

7. I want _______(play) the piano in the evening.

8. We should stop_______(throw) about in public.

9. The knife _______(use) to cut things.

10. I think English is very _______(help) to know about the world.