More and more people choose to shop in a supermarket as it offers a great _______ of goods.
| A．variety | B．mixture | C．extension | D．combination |
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 |