-- Have you known each other for long?
--- No, not very long, ____ we started to study at the college.
| A．when | B．since | C．after | D．before |
The _____ look on his face showed that he had enough confidence in himself.
| A．surprised | B．puzzled |
| C．excited | D．determined |
She didn’t ______ work when she had the baby.
| A．give in | B．give out | C．give away | D．give up |
______ the students in our class is 50 and _______ them study very hard.
| A．The number of; the number of | B．A number of ; the number of |
| C．The number of; a number of | D．A number of; a umber of |
She searched all the places where she _____ have left her necklace but it was all in vain.
| A．might | B．would | C．could | D．should |
---- Why don’t you try to do exercise to lose weight?
---- I have tried everything but it has made no _____________.
| A．use | B．result | C．conclusion | D．difference |