1. _____the exam, he would have attend a college.

A. If he passed B. Had he passed C. Were he passed D. If he should pass

2. _____ five minutes earlier, you could have seen them off.

A. If you should arrive B. If you arrive C. Had you arrived D. Should you arrive

3. _____it rain tomorrow, we should have to put off the visit to the Science Museum.

A. Were B. should C. would D. will