Fred entered without knocking and, very out of breath, sank _______ a chair. 
| A．on | B．off | C．into | D．to |
---- Why is the cake so expensive?
---- Maybe you don’t know a cake made of wheat costs less than _____ made of rice.
| A．one | B．that |
| C．the one | D．another |
---- Do you think it's a good idea to make friends with your students?
---- _____ , I do．I think it's a great idea．
| A．Really | B．Obviously | C．Actually | D．Generally |
---- I wonder how much you charge for your services．
---- The first two are free ____ the third costs $30．
| A．while | B．until | C．when | D．before |
–What did you say?
--So you _____________ to me.
| A．won’t listen | B．didn’t listen | C．haven’t listened | D．weren’t listening |
My laptop computer, which no one can ____________, has been out of order for a week.
| A．get gone | B．have to go | C．get going | D．have gone |