It is bad manners to ________an invitation without a reason.
| A．break down | B．settle down | C．turn down | D．calm down |
The idea of protecting environment has been _____ a large extent accepted in this area.
| A．in | B．at | C．to | D．for |
______ you eat the correct foods ______ be able to keep fit and stay healthy.
| A．Only if; will you | B．Only if; you will |
| C．Unless; will you | D．Unless; you will |
__________ into consideration, they believed themselves more and returned to their positions.
| A．Nothing to take | B．Everything taking |
| C．Nobody to be taken | D．Everything taken |
Recently, the Chinese government gave some examples of _______ Dalai Lama’s visiting foreign countries had affected China.
| A．that | B．what | C．how | D．whether |
______ the Internet is of great help, I don’t think it’s a good idea to spend too much time on it.
| A．If | B．While | C．Because | D．As |