The math problem is so hard． I really don’t know________.
| A．how to do it | B．how to do |
| C．what to do it | D．where to do it |
---Is Mr Hu in the reading room?
---No, he _______be there. He has gone to Tianjin.
| A．mustn’t | B．needn’t | C．won’t | D．can’t |
Some of her best loved photos are ___ display in this exhibition .
| A．on | B．in | C．at | D．about |
________ important news!
A. How B. What C. What an D How an
________ animals are in danger and there will be ________ space for them if we don’t take any actions.
| A．More and more, more and more | B．Less and less, less and less |
| C．More and more, less and less | D．Less and less, more and more |
We must hurry up, ________ we’ll miss the plane.
| A．or | B．and | C．but | D．so |