A smart phone makes a big _______ to our life．（ ）
| A． |
difference |
B． |
decision |
C． |
progress |
D． |
prediction |
They could look after when they were six．（ ）
A．ourselvesB．themselvesC．yourselves
﹣Do you know in class？
﹣Sorry，I didn't go to school，either．（ ）
A．what he saidB．what did he say
C．what he says
It will the workers ten days to finish all the work．（ ）
A．takeB．spendC．pay
room is big and nice．（ ）
A．Kate's and Jane'sB．Kate's and Jane
C．Kate and Jane's
﹣Mum，must I clean my room？﹣No，you ．（ ）
A．mustn'tB．needn'tC．can't