．_________life began on the earth is one of the biggest puzzles to scientists.
| A．How | B．What | C．Where | D．That |
“Mom_______ the supermarket,” the daughter said to her father.
| A．has gone to | B．has been to | C．goes to | D．go to |
The new stadium being built for the next Asian Games will be _______ the present one.
| A．as three times big as | B．three times as big as |
| C．as big as three times | D．as big three times as |
—Are you going to Tom’s birthday party? --- ________. I might have to work.
| A．It depends. | B．Thank you. | C．Sounds great. | D．Don’t mention it. |
It was a nice meal, _______ a little expensive.
| A．though | B．whether | C．since | D．that |
Bring the plants into a warm room ________ they will grow quickly.
| A．or | B．and | C．but | D．for |