—Oh, dear. I forgot the air tickets.
—You __________ something.
| A．have left | B．are always leaving |
| C．are leaving | D．always left |
We can surely overcome these difficulties _,___ we are closely united.
| A．so far as | B．so long as | C．as soon as | D．as well as |
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 |