II.
1. leave - is covered
2. use - will become
III.
1. shortage
2. unsuccessful
3. surprising
4. extremely
IV.
1. I suggest collecting plastic bags.
2. He will give up smoking if his son asks him to do it.
3. The waiter wasn't very nice, but the food was delicious.
4. He was glad that all his classmates came to the stadium to support his team.