What the teacher said in class set all the _____ a lot. 

In the face of danger, we need to stay ____. Only in this way can we come up with good solutions.

– Do you have any idea which to choose?--- Well, you’d better take this one. It’s ______in price and good in quality.

 Would you be ______ to turn down the gas fire a little?

---Have you read the book?---Yes. But that one is _____worth reading. I suggest you______ it if you have time.