Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.
| A．how that was | B．what was it |
| C．why it was that | D．what it was that |
By the year 2020 scientists _____ a lot of research on AIDS.
| A．had done | B．do | C．are doing | D．will have done |
The former manager of the company was said _____ in an organized crime.
| A．to be involved | B．to involve |
| C．to have involved | D．to have been involved |
_____ is commonly believed that the play was written by Shakespeare.
| A．It | B．That | C．What | D．As |
I will buy this type of car _____ the price is brought down to under 10,000 dollars.
| A．even if | B．provided that | C．unless | D．whether |
Her interesting face, with a long nose and big eyes, is what makes her _____.
| A．stand by | B．stand for | C．stand up | D．stand out |