Do you know _____ we are talking about? Come and I’ll tell you.
| A．which Mark Twin’s |
| B．which novel of Mark Twin |
| C．which novel of Mark Twin’s |
| D．Mark Twin’s which novel |
If you are travelingthe customs are really foreign to your own, please do as the Romans do.
| A．in which | B．what | C．when | D．where |
Isn't it time you got down tothe papers?
| A．mark | B．be marked | C．being marked | D．marking |
I just wonder ____ that makes him so excited.
| A．why it does | B．what he does | C．how it is | D．what it is |
Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
| A．/; the | B．the; / | C．an; the | D．the; a |
The doctor must be _______ 24 hours a day, 7 days a week in the boarding school.
| A．on call | B．by hand | C．in sight | D．on spot |