. To improve your spoken English, you’d better listen to the tape ______.

If a person takes drugs, they will slow down his thinking and ________ turn off his brain. 

There is no doubt that I'm trying to do what is best, but ________ I have got to consider the cost.

I shall take you to France ________ you are well enough to travel. 

He looked ________ at the news that his favorite team had lost the game and felt ________ that Martin should have taken part in it.