It doesn’t often snow in my hometown in winter, but it ___be rather cold sometimes. 

---Dad, must we wait until the light becomes green?---Yes, I’m afraid we ______. That’s the traffic rule.

 —Mum, would you please buy me an MP5 player?—If you can help do the dishes the whole vacation, you ________ have one as a reward.

You _________ drive on when the traffic light is red.

 According to the agreement, nobody _______ let out how they spent the three days in the cave.