Mary____ a math problem with her classmates when the math teacher knocked at the classroom door．（ ）
| A． |
has discussed |
B． |
was discussed |
| C． |
was discussing |
D． |
discusses |
I sleep with the window open it's really cold．（ ）
A．unlessB．tillC．or
It's a good idea to new words in the dictionary．（ ）
A．cut upB．look upC．put up
Please here earlier! We don't want to miss the last bus to the library．（ ）
A．arriveB．to arriveC．arriving
Let's save pandas! There only about 2， 000pandas living in the forests now．（ ）
A．amB．isC．are
Do you agree my plan？
Yes， it is wonderful．（ ）
A．inB．withC．of