1 . 瓦斯科·达·伽马(1460－1524)是一名葡萄牙探险家，也是第一个从海上到达印度的欧洲人。[the＋序数词(＋n.)＋to do]
Vasco da Gama(1460－1524) was a Portuguese explorer and ________by sea.

2 . 怎样保护脆弱的生态环境是最令人关注的问题。(疑问词＋动词不定式)
________________ was among the top concerns.

3 . 据说，亚历山大大帝和马可·波罗在印度参观过这样的一棵树。(be said to have done...)
Alexander the Great and Marco Polo ________________ such a tree in India.

4 . _______(have) a chance to experience this, you can stop by a village pub and relax with a local beer. (所给词的适当形式填空)

5 . Christopher Columbus discovered what he viewed as India on the epic voyage, only ______ (inform) that what he discovered was a new land. (所给词的适当形式填空)

6 . The spacecraft broke down suddenly only___________（stop）the ongoing mission. (所给词的适当形式填空)

7 . On this day, the moon is said ______ its biggest and brightest. (be) (所给词的适当形式填空)

8 . I arrived at Mr Li’s office, only ________________ (find) it was locked. (所给词的适当形式填空)

9 . He promised that he would do whatever he could ________ (help) me, but he didn’t. (所给词的适当形式填空)

10 . The problem _______________ (refer) to at the meeting tomorrow is about environmental pollution. (所给词的适当形式填空)