His sister left home in 1998, and _______since. 
| A．had not been heard of | B．has not been heard of |
C．had not heard of | D．has not heard of |
--- Could I ask you a rather personal question ?
--- ________.
| A．Yes, don’t worry | B．Of course , go ahead |
| C．Yes, help yourself | D．Of course , why not ? |
At present the hotel is almost empty , but I’m sure things will start to _____ in the spring .
| A．rise up | B．hold on | C．pick up | D．hang out |
--- How much vinegar(醋) did you put in the soup ?
--- I’m sorry to say , _______. I forgot .
| A．no | B．no one | C．nothing | D．none |
_______ all the inventions have in common is ______ they have succeeded .
| A．What ; what | B．That ; that | C．What ; that | D．That ; what |
We _______ each other the best of luck in the examination .
| A．hoped | B．wished | C．expected | D．wanted |