—Where is Bob? I cannot find him anywhere.
—He have been off long. I heard him make a call 
just now.
| A．shouldn’t | B．can’t | C．mustn’t | D．needn’t |
________ is known to us all, our government has spared no efforts to control food prices.
| A．What | B．Which |
| C．As | D．It |
Meizhou Island is such a beautiful place of interest________ everyone likes to visit.
| A．as | B．that |
| C．which | D．where |
They didn't find the name of the boy in the list, ________， of course, made them very disappointed.
| A．that | B．who |
| C．which | D．whose |
Many people tend to buy things from big store, ________ they believe the qualities are good.
| A．at which | B．of which |
| C．which | D．where |
I felt most angry about the way ________ I was treated when I was shopping.
| A．when | B．that |
| C．which | D．where |