Do not let any failures discourage you, for you can never tell ________ close you may be to victory.
| A．how | B．that | C．which | D．where |
______ 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 |
Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...
| A．referring | B．referred to | C．referring to | D．were referred |
His report was so exciting that it was interrupted by applause(鼓掌).
| A．constantly | B．constant | C．seldom | D．never |