The Palace Museum has a _________ of 96 million pieces of ancient Chinese art works．
| A．collection | B．mixture |
| C．combination | D．series |
．—It’s a long time since I saw my brother．
—Why ________ him this weekend?
| A．not to visit | B．don’t visit | C．not visit | D．not visiting |
—Would you mind closing the window to keep out the noise?
—________．I’ll do it right away．
| A．No way | B．Of course | C．Pretty good | D．Not at all |
There are about ______ people in the park on National Day.
| A．three hundred | B．three hundreds |
| C．three hundred of | D．three hundred more |
We found ______ very difficult for the children to understand what the chairman said at the meeting.
| A．that | B．its | C．this | D．it |
．________ useful book is helpful to ________ artist.
| A．An, an | B．A, a | C．A; an | D．An; a |