------Tony, are you listening to me ？
------Sorry sir, I to understand what you said just now.
| A．try | B．was trying | C．tried | D．have tried |
Some people either _____ avoid questions of right and wrong or remain neutral about them.
| A．violently | B．sincerely | C．properly | D．deliberately |
If he refuses to _____ my plan, I can probably find someone more cooperative.
| A．put up with | B．fall in with | C．keep up with | D．catch up with |
I heard_____ voice that had been shouted to me as a child.
| A．every | B．such | C．any | D．one |
.How can you pass the examination_____ you never attended class?
| A．in case | B．even if | C．unless | D．when |
Don’t touch anything in the lab unless____.
A. to be allowed B. allowed C, to be allowing D.allowed to