The first decade of the 21st century _____ the breathtaking and non-stop development of China．
| A．witnesses | B．witnessed | C．will witness | D．had witnessed |
In the past ten years, great changes _______ in my hometown.
| A．took place | B．have taken place |
| C．were taken place | D．have been taken place |
The third and last chapter _______ by Professor Chen.
| A．are written | B．are writing | C．is written | D．is writing |
-- No, I’m afraid he isn’t in. This is his secretary speaking. Can I help you?
--- _______.
| A．Oh, you will | B．Oh, that’s a pity |
| C．I should think so | D．Well, I look forward to hearing from you |
______ the plane have taken off on time?
--- I’m afraid not. The fog was too thick then.
| A．Would | B．Should | C．Can | D．Must |
There have been many changes in _____ history of _____ English language.
| A．a; the | B．the ; / | C．/; the | D．the; the |