---How long are you staying?
---I don’t know. .
| A．That is ok |
| B．Never mind |
| C．It depends |
| D．It doesn’t matter |
Going on a trip________be expensive and difficult , so making a plan is necessary.
A. must B. ought to C. shall D can
________, follow the directiom on the bottle carefully.
| A．Takes medicine | B．To take medicine |
| C．When one takes medicine | D．When taking medicine |
.He is said________a book on the history of Chinese tone bridge , but I don’t know if he has finished it.
A. to have written B. to be writing C . having writing D writing
There are boys________from 7 to 14________age.
A. ranging , of B rang , in C. ranging , in D. range , of
While shopping ,people sometimes can’t help________into buying something they don’t really need.
| A．persuade | B．persuading | C．being persuaded | D．to be persuaded |