Don't use water to put out the fire if oil catches fire. As is known, oil ________ float on water.
| A．shall | B．must |
| C．may | D．will |
How the big forest fire has ________ remains to be a mystery.
| A．broken out | B．broken up | C．taken place | D．turned up |
Only ______ a human being.
| A．when is it hungry a lion will attack |
| B．when it is hungry a lion will attack |
| C．when it is hungry will a lion attack |
| D．when is it hungry will a lion attack |
---Why didn’t you tell me the truth about his illness?
---___________, I knew nothing about it at that time.
| A．Tell you the truth | B．Telling you the truth |
| C．To be honest | D．Being honest\ |
---I am afraid that I have to trouble you with this question.
---___________.
| A．No,you cannot | B．Go ahead | C．Not at all | D．I don’t mind |
--How long are you staying ?
-- I don’t know . ______.
| A．It depends. | B．That’s OK. | C．Never mind. | D．It doesn’t matter. |