______ abroad for more than two years, he returned to his hometown.
| A．Studied | B．Studying |
| C．Having studied | D．To study |
I firmly believe _____ he said at the meeting was right.
| A．that | B．which |
| C．that what | D．what that |
___ difficult the task may be, we must fulfil it this month.
| A．No matter how | B．No matter what | C．No matter when | D．No matter where |
“_____ when does the pub stay open？” “About midnight.”
| A．Since. | B．Before |
| C．Until. | D．After |
___you understand this rule, you will have no further difficulty.
| A．Once | B．At once | C．Only | D．Only then |
“Shall we stop for lunch _____ shall we drive on？” “Let’s stop for lunch, but the driver can’t drink _____ drive.”
| A．and, and | B．or, or |
| C．and, or | D．or, and |