1. (2015九上·诸暨期中) 用方框中所给单词的适当形式填空，每词仅用一次。

pronounce   help   remain   polite   drive

1. （1） The book is very , so I'd like to buy one for my son.
3. （2） Nothing the same for long. We either keep moving forward or we get left behind.
   
5. （3） If you want to get there quickly, you should avoid in the center of the city.
7. （4） I'm afraid of speaking English because my is poor.
9. （5） Although the customer is rude(粗鲁的）, you should speak to him .