—Where is Tom?
—Well, he______ you_______ here．Otherwise he would come down right now．
| A．didn’t know；were | B．hasn’t known；are |
| C．doesn’t know；are | D．hadn’t known；were |
Once lost, _____________.
| A．it is difficult to get such a chance again. |
| B．such a chance will never come again. |
| C．one can never get such a chance. |
| D．to get such a chance will be difficult. |
us to finish the work today and I’ll be pleased to go.
| A．Join | B．Joining |
| C．If you join | D．To join |
Some insects ________the colour of their surroundings to protect themselves
| A．take on | B．take in |
| C．take off | D．take up |
—What about talking with others while learning spoken English?
—In my opinion,.
| A．it makes sense | B．It’s out of the question |
| C．it’s up to you | D．it’s hard to say |
Susan, _______ university student from Europe, teaches me _______ art in her spare time.
| A．an; / | B．a; the | C．an; the | D．a; / |