Whose bike is this？
I am not sure．It ______ be Mary's （ ）
| A． |
shall |
B． |
must |
C． |
might |
Oh，my God!I you were in Beijing，too!When did you come？
I have lived in Beijing since 2015．（ ）
| A． |
don't know |
B． |
didn't know |
| C． |
haven'I known |
D． |
wasn't known |
Do you know her well？
Sure．We friends since ten years ago．（ ）
| A． |
were |
B． |
became |
| C． |
have become |
D． |
have been |
Lucy you can't go to the party．One of you has to stay at home to look after your grandma．（ ）
| A． |
Neither； nor |
B． |
Either；or |
| C． |
Not only； but also |
D． |
Both；and |
How are you today，Tom？
I'm even ．I don't think this medicine is good for me．（ ）
| A． |
worse |
B． |
badly |
C． |
better |
D． |
well |
There are fifty students in Class One．Twenty of them are boys； are girls．（ ）
| A． |
the other |
B． |
the others |
C． |
others |
D． |
another |