How ______ universe came into being is a puzzle to ______ scientists of all generations.
A. the; 不填 B. an; the C. a; 不填 C. 不填；the
—What’s the matter _______Mike? He is wet through.
—His car ran _______the river.
| A．with, into | B．for, in | C．with, to | D．to, at |
Pleaseask________nottoskateonthethinice.It’sverydangerous.
| A．they | B．them | C．their | D．theirs |
Wouldn’titbe______wonderfulworldifwecouldlivein______peace?
| A．a;the | B．the;不填 | C．a;不填 | D．the;the |
—Why did Sarah cry just now?
— She wanted a toy, _____ I can’t afford.
| A．it | B．one | C．that | D．what |
You’d better keep ______ when I take photos for you.
| A．silent | B．calm | C．still | D．mild |