用所给单词的适当形式填空。    

1. We're planning        ___(have) a picnic in the mountains.

2. She is getting used to             (eat) with chopsticks.

3. When I first ate in a western restaurant, I didn't know how_______(use) a knife and a fork.

4. There are many____   __(knife) on the table.

5.I will be       ___(please) to help you if you ask me for help.

焦油加工的主要任务是获得酚、萘、蒽等纯产品和（）等粗产品。