28. ---- Who told you my email address?
---- I don’t remember clearly. It _______ Karen.
---- It _______ Karen. She doesn’t know my email address.
| A．may have been; can’t have been | B．must have been; mustn’t have been |
| C．may have been; must have been | D．must have been; mustn’t be |
After China’s reform and opening up,the people work harder and they believe their hard work leads to___
| A．rewards |
| B．prizes |
| C．awards |
| D．results |
We thought of selling this old furniture,but we decided to___it.It might be valuable
| A．hold on to |
| B．keep up with |
| C．turn to |
| D．look after |
I have ___the shape of the house,but I have given no details
| A．given out |
| B．sent out |
| C．blocked in |
| D．thought out |
—___do you think of the book on the desk?
—I don’t think this book is by far the most boring.I have seen___
| A．What;better |
| B．What;worse |
| C．How;the best |
| D．How;the worse |
My teacher told me to___it before I accepted what you gave me
| A．think about |
| B．think twice |
| C．think up |
| D．think out |