. One of the students hasn’t prepared lessons very well.
| A．his | B．one’s | C．ones | D．their |
While listening to the concert, the audience is required to remain ______ and keep quiet.
| A．seated | B．to be seated | C．seating | D．to seat |
It is important to know about the cultural differences that______ cause problems．
| A．must | B．may | C．dare | D．shall |
In classes, you’d better understand as much as possible while ______ notes.
| A．take | B．taken | C．taking | D．to take |
Thank you for all your hard work last week. I don’t think we ______ it without you.
| A．could have managed | B．can manage |
| C．could manage | D．can have managed |
The Great Wall is a place ______ almost all tourists would like to visit when they come to Beijing．
| A．why | B．which | C．when | D．where |