48. They were all tired, but _____ of them would stop to take a rest.
| A．any | B．some | C．none | D．neither |
To go abroad to study, you should __________ master the language.
| A．at most |
| B．at the latest |
| C．at least |
| D．at last |
I hadn't seen him for 10 years but I __________ him at first sight.
| A．realized |
| B．spotted |
| C．watched |
| D．observed |
-How about the book you are reading now?
-Excellent indeed. You can find many problems we have come across __________ in it.
| A．covered |
| B．covering |
| C．are referred |
| D．referred |
If it had rained even a drop, things would be much better now and the crops in the fields __________.
| A．wouldn't die |
| B．didn't die |
| C．hadn't died |
| D．wouldn't have died |
A lot of people often forget that oral exams __________ to test our communicative ability.
| A．design |
| B．are designed |
| C．are designing |
| D．are being designed |