According to the school rules, if a student _________ happen to damage something by accident,he/she should report it to a teacher or the office immediately.

— Shall we take a taxi? — No, we         . It’s not far from here.

It’s quite warm here; we __________turn the heating on yet.

Brain, like muscles, also needs some kind of exercise and nutrition. The more you use your brain in the right direction, the more you ________ enhance your ability.

There ________ be any difficulty about passing the road test since you have practised a lot in the driving school.