______life began on the earth is one of the biggest puzzles to scientists.
| A．How | B．What | C．Where | D．That |
Do you remember it was on ______ Saturday night that you saw such ______ bright moon?
| A．a; a | B．the; the | C．a; the | D．the; 不填 |
_____ you have learned one foreign language, you will find it quite easy to learn another.
| A．Once | B．Before | C．Though | D．Because |
This book is for the students native language is not English．
| A．that | B．who’s | C．whose | D．which |
. He _____ live in the country; but now he has _________in the city.
| A．used to; been used to living | B．was used to; used to live |
| C．used to; be used to live | D．was used to; used to living |
—Hi, Tommy, got a minute? —________, what's on your mind?
| A．No, I'm sorry | ||
| B．Sure, come in | C．Of course not, help yourself | D．Yes, it's one clock. sharp |