With sufficient scientific information a manned trip to Mars should be _____.
| A．obtainable | B．potential | C．considerable | D．feasible |
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Gui zhou Province is a place with quantities ofresources.
| A．invisible | B．crystal clear | C．potential | D．rich |
In 1720, Bach’s wife suddenly died, him with four children.
| A．leaving | B．to leave |
C．left  |
D．had left |
It is a fact that there is atowards regional cooperation.
| A．attendance | B．tendency | C．pretence | D．fancy |
On turning on the computer, .
| A．Mum told me to have supper. | B．a game appeared on the screen. |
| C．there was something wrong with the mouse | D．I found a strange E-mail. |
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