第一节 单项填空(共15小题；每小题1分，满分15分)
21. — Oh , must you ? Stay a bit longer. It has been such ______ fun having you here.
— Thanks. I’ve got______ early start tomorrow morning.
A. a; an B./; the C./; an D. the ;/
22. Don’t you think it essential that every resident of Nanjing __________ spare no effort to make contributions to Nanjing 2014 Youth Olympic Games?
A．should B．will C．shall D．would
23. Almost everyone has his own strengths and weaknesses. It is ________ others are weak that maybe you have a great advantage.
A. as B. where C. that D. what
