21. After the new technique was introduced, the factory produced ______ cars in 2009 as the year before.
| A．as twice many | B．twice as many | C．as many twice | D．twice many as |
–What are you going to do this weekend?
--________．If time permits, I may go to Shanghai with my friends．
| A．Don’t mention it | B．It doesn’t matter | C．Forget it | D．It depends |
---Isn’t that your teacher over there?
---No, it ______ be him. I’m sure he doesn’t wear glasses.
| A．can’t | B．must not | C．won’t | D．may not |
----He seems to be lost in thought. Why?
---Because the film _____ his memories of his childhood.
| A．calls up | B．picks up | C．brings up | D．takes up |
Seeing the bad results of the exams, she was rather upset and felt _____ about her future.
| A．surprising | B．puzzling | C．puzzled | D．surprised |
When the news came _______ the war broke out, he decided to serve in the army.
| A．since | B．which | C．that | D．because |