Do you have trouble ______ the post office?
| A．to have found | B．with finding |
| C．to find | D．in finding |
He is always helping people without expecting anything ______.
| A．in need | B．in fact | C．in danger | D．in return |
I will mark ______ everything you say.It is helpful to the English learners.
| A．up | B．down | C．out | D．off |
—Believe me，all your efforts will ______ some day.
—Thanks for your encouragement.
| A．pay back | B．pay down | C．pay off | D．pay for |
Some blood types are quite common，others are regionally______，and still others are rare everywhere.
| A．distributed | B．contributed | C．obtained | D．convinced |
Don't be ______ by products promising to make you lose weight quickly.
| A．taken off | B．taken out | C．taken away | D．taken in |