His study in Peking University lasted four years, ______ he founded his own company in Hong Kong.
| A．after which | B．after when |
| C．after that | D．after it |
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 |
Years of hard work almost made him ________________.
| A．break up | B．break out |
| C．break down | D．break off |