All the students at school are required to ____ lectures by the experts on howto save themselves when accidents occur, such as fires, a gas leak and so on.

Armed with the information you have gathered, you can ____ preparing your business plan.

They are against the plan. For it ____ too much farmland.

In the time of social reform,people’s state of mind tends to         with the rapid changes of society.

The workers could hardly        the boss’s bad temper but under his supervision they had to             themselves to working harder.