Since nobody gave him any help，he________have done the research on his own.
| A．can | B．must |
| C．would | D．need |
She said she would spend her holiday ___ Beijing.
| A．on | B．at | C．in | D．for |
Whenever I go to Beijing, ____ is quite frequent, I will go to visit the Great Wall.
| A．where | B．which | C．as it | D．it |
Who is it up ____ decide whether to go or not?
| A．to to | B．to | C．for to | D．to for |
Wang Mei is one of many Chinese teenagers _____ “on the go”
| A．who lives life | B．who live life | C．that lives living | D．that live living |
The two boys fought and fought until one ______.
| A．gave up | B．gave in | C．gave | D．gave off |