When you read a book, you should make a mark ______ you have any question.
| A．where | B．which | C．that | D．what |
Can we see _____sun when we are in ______space?
the;the B.the;/ C./;the D./;/
------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 |