As we know，the Great Wall ________from west to east.
| A．fights its way | B．feel its way |
| C．winds its way | D．make its way |
It was never clear ________ the man hadn't reported the accident sooner.(2011·江苏)
| A．that | B．how | C．when | D．why |
It doesn't matter ________ you turn right or left at the crossing—both roads lead to the park.
| A．whether | B．how | C．if | D．when |
________ was most important to her，she told me，was her family.
| A．It | B．This | C．What | D．As |
It suddenly occurred to him ________ he had left his keys in the office.(2012·江西)
| A．whether | B．where | C．which | D．that |
Have you noticed the problem ________ he is now in low spirits？________ come?
| A．where；What | B．that；How |
| C．in which；For | D．what；As |