No one believes his reasons for being late that he was caught in a traffic jam, _______ made him embarrassed.
| A．it | B．which | C．that | D．why |
The dodo became extinct fairly recently so its DNA is still ________ .
| A．in good condition | B．in good state |
| C．in good conditions | D．out of a condition |
Exactly when the first people arrived in ________ we now know as California, no one really knows.
| A．which | B．what | C．that | D．it |
The patent officer ______ with my file explained to me that a plant variety is not a/an _______ invention as it is a result of adjusting growth scientifically.
| A．dealing; abrupt | B．dealt; innocent |
| C．deals; practical | D．dealing; valid |
The scientist __________ the experiment for half a year, but he _______ yet.
| A．made; didn’t succeed | B．made; hasn’t succeeded |
| C．was making; didn’t succeed | D．has been making; hasn’t succeeded |
Seeing the picture, I couldn’t resist ______the days_____ we spent together.
| A．to think of; when | B．thinking of; which |
| C．to think of; which | D．thinking of; when |