The mobile phone has changed people’s life a lot ________ it was invented.
| A．until | B．since |
| C．before | D．after |
What do you think of maths， John？
For me， maths is than any other subject．（ ）
| A． |
difficult |
B． |
more difficult |
| C． |
most difficult |
D． |
the most difficult |
Study harder， you won't catch up with your classmates．（ ）
| A． |
or |
B． |
for |
C． |
since |
D． |
although |
Each of us WeChat（微信） nowadays， even the old people．（ ）
| A． |
plays |
B． |
play |
C． |
playing |
D． |
played |
There are about three students in our school．（ ）
| A． |
thousands |
| B． |
thousands of |
| C． |
thousand |
| D． |
thousand of |
What did you do last night， Grace？
First， I did my homework， and then I played piano for 30 minutes．（ ）
| A． |
a |
B． |
an |
C． |
the |
D． |
/ |