23. Everyone should remember it is very important to _____ the balance of nature toady.
| A．get | B．make | C．keep | D．Remain |
—Come in, please. Make yourself at home.
—I'm glad you like it.
A. Thanks. You have a nice place here.
B. Oh, this picture is so beautiful!
C. Thanks. What nice food you've prepared!
D OK. Let me look around your new house.
What a pity! He____________ the only chance of success.
| A．threw away | B．put down | C．gave in | D．broke off |
Jack is one of those men who_________ best evening the most difficult situations.
| A．his | B．your | C．their | D．one's |
—You don't seem to be quite yourself today. What's wrong?
—Oh, I'm suffering from a cold. Nothing serious,
| A．yet | B．indeed | C．though | D．anyway |
__________ you understand the rule, you will have no further difficulty.
| A．While | B．Once | C．Though | D．Unless |