—I am going to America.
—how long you there?
| A．are; stayed | B．are; staying | C．have; stayed | D．did; stay |
--Your effort is sure to pay __________
---Thank you for your encouragement.
| A．off | B．for | C．back | D．down |
“Would you take this along to the office for me?” “_________.”
| A．That’s right | B．With pleasure | C．Never mind | D．Not at all |
While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed ________ man’s understanding of color.
| A．a; 不填 | B．a; the | C．不填; the | D．the; a |
It is reported that the police will soon ________ the case of the two missing children.
| A．look upon | B．look after | C．look into | D．look out |
Don’t be discouraged. ________ things as they are and you’ll enjoy every day of your life.
| A．Taking | B．To take | C．Take | D．Taken |