_________we all know, Americans are competitive.
| A．As | B．Which | C．What | D．That |
—Would you tell me ____you want your tea, with sugar or milk?
—Sugar, please.
| A．whether | B．when | C．what | D．how |
As your spoken English gets better, so ___ your written English.
| A．will | B．do | C．is | D．has |
I have only one day left ___ traveling to Kunming and then flying back home.
| A．when | B．as | C．before | D．while |
This is our contribution to ________ world of the 21st century, ________ world of independence and mutual understanding.
| A．the; / | B．/; a | C．a; the | D．the; a |