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1. While I was driving, I realized that the car wasn′t working properly.
While I was driving, I realized that . 

2. He took an instant course in Spain- he wanted to be in a position to speak it when he went on business to South America.
He wanted to be able . 

3. To be there on time is important.
It . 

4. The clown made them laugh a lot.
They . 

5. I suppose it′s possible that she didn′t understand my message.
I suppose .