________about her son’s future, the mother has been sleeping very badly these months.
| A．Concerning | B．Concerned | C．To concern | D．Having concerned |
It was in the Xichang Satellite Launch Center , ________ I had visited, ________ Chang’eⅠwas launched at about 6:05 pm October 24, 2007.
| A．where; that | B．which; that | C．that; where | D．which; where |
After the class was over, the student apologized _______ the teacher ______ his coming late.
| A．/; because | B．/; for | C．to; because | D．to; for |
_____________ well prepared you are, you still need a lot of luck in mountain climbing.
| A．However | B．Whatever | C．No matter | D．Although |
I think only when he attends college _______________ more independent of his parents.
| A．will he become | B．he becomes | C．he will become | D．becomes he |
Using his hybrid rice, farmers are producing harvests ________________ before.
| A．as large twice as | B．twice as large as |
| C．twice larger as | D．as large as twice |