1. Bill is in class 12, whereas John, who is a year older, is only in class 4.

2. You must leave at once, otherwise you miss the train.

3. You need to get some job retraining. If not, you risk being laid off.

4. Could I have rice instead of potatoes, please?

5. Despite his denial, we knew that he was guilty.

EXERCISE 4: FILL THE BLANK WITH SO, BUT, THEREFORE, HOWEVER

1. It was raining heavily, so we decided to stay indoors.
2. She was tired, but she kept working.
3. The traffic was bad, therefore we were late.
4. He didn't like the meal; however, he ate it politely.