“Is John coming by train?” “He should, but he _________ not. He likes driving his car.”

You look very tired. You ____ late last night.

---Where is my reference book? It was here a moment ago.---Someone ___ it by mistake.

 It was Mr. Zhang that helped us out of the trouble. Without his help, we ______ it so easily.

It’s quite impossible that it will rain tomorrow. But if it _______, I would still go to the park.