My mother_______ if she ________her work this week．
A．comes back；finishes
B．comes back；will finish
C．will come back；finishes
D．will come back；will finish
---My brother fell off his bike and hurt himself. --- .
A. Don’t worry
B. It doesn’t matter
C. I’m sorry to hear that
D. He should be careful
Environment(环境) is very________，but you don’t understand the_______ of it，you always drop litter everywhere．
A．important，important
B．important，importance
C．importance，importance
D．importance，important
He spent as much money as he could _______ a new iphone6.
A. buying B. buy C. to buy D. bought
The teacher told me _________when I left the classroom.
A. lock the door B. to lock the door
C. to knock at the door D. knock at the door
There ______ a large number of students in our school. The number of the students _______ over three thousand.
A. is, is B. are, are
C. is, are D. are, is
