According to an old proverb，a red sky at night often fine weather the next day．
| A．indicates | B．impresses | C．obtains | D．occurs |
My grandfather has a large __________ of stamps.
| A．correction | B．collection |
| C．connection | D．section |
It is a research group __________ 2 teachers and 8 students.
| A．consist of | B．consisting of |
| C．consists of | D．consisted of |
I can’t understand why he should tell a lie! He is my best friend! It doesn’t _____________.
| A．make sure | B．make out |
| C．make sense | D．make meaning |
If you _____________ your study, I am sure you will make greater progress.
| A．concentrate on | B．concentrate to |
| C．focus to | D．focus at |
_________ English can be difficult to learn, it is a very useful tool for communication.
| A．As | B．When |
| C．While | D．Because |