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 |
------I need some fresh air, so I am going out for a walk.
-------__________________
| A．Have fun! | B．With pleasure! | C．You had better not! | D．It is none of my business! |
The reason _____ he could not go there was _____ his grades were too low.
| A．why ; because | B．that; because | C．why; that | D．that; that |
________students are playing on the playground. ______students there is at least over 100.
| A．A number of; A number of | B．The number of; The number of |
| C．A number of; The number of | D．The number of; A number of |
It was in the park_____the lost bike was spotted yesterday.
| A．which | B．that | C．where | D．what |
He is so fat that he has decided to______.
| A．lose weight | B．lose his weight | C．put on weight | D．put on his weight |