They will fail the exam_______they try their best.
| A．unless | B．once | C．since | D．after |
Money is important ______ it’s not the most important thing.
| A．and | B．but |
| C．or | D．so |
—Whose shirt is this?
—It ______ be Li Lei’s. It is too big for him.
| A．could | B．must |
| C．might | D．can’t |
Could you tell me ______ the bookshop is?
| A．what | B．how |
| C．whether | D．where |
I don’t know ______ he will come tomorrow. ______ he comes , I’ll tell you.
| A．if ; Whether | B．whether; Whether |
| C．if ; That | D．if ; If |
He was afraid ______ make friends with anyone.
| A．of | B．to |
| C．in | D．for |