The population of China is larger than ______ of the United States.
| A．this | B．that | C．these | D．those |
This is a picture of Dr. Yuan, a scientist ____ is well known in our country.
| A．which | B．who | C．whom | D．whose |
Only when I left my parents for Italy ________ how much I loved them.
| A．I realized | B．I had realized | C．had I realized | D．did I realize |
There was _____ time _______ I hate to go to school.
| A．a, when | B．a, that | C．/, when | D．the, that |
.--- Robert, you didn’t travel by train?
--- I was going to, but then I decided to go by car______.
| A．yet | B．either | C．instead | D．indeed |
--- Rose, will you go to the museum with me this afternoon?
---_____ . My aunt is coming to see me.
| A．Congratulations | B．No problem. | C．Sorry, I can’t | D．Glad to hear that |