Question

四道英语选择题，现在急需得到正确答案，请高手赐教正确答案。高分感谢！

四道选择题，希望各位高手能帮助一下，多谢了！个别拼写可能有误，希望能明白意思即可。在线等待！
一、she空格her life空格to save the drowing child
1.risk,to try
2.risked,trying
3.risks,trying
4.risked,to try

二、空格 visiors to the UK were asked by newspaper reporters impressions of the British people were.
1.The number of
2.A number of
3. number of
4.Any number of

三、Scientists think that continents空格always where they空格today
1.aren't,are
2.aren't,were
3.weren't,are
4.weren't,were

四、As is know to us all,eating too much sugar can 空格health problem
1.run across
2.come to
3.meet with
4.lead to

五、they空格on the program for almost one week before i joined them,and now we空格on it as no good results have come out so far
1.had been working,are still working
2.had worked,were still working
3.have been worked,have worked
4.have worked,are still working

谢谢~~~

Answer 1

BBCDA
1.risk doing 又因为他叙述过去一件事，用ed
2.A number of大量的 作主语，谓语用复数。 The number of 。。。。睁老的数量 谓语用单三
3.科学家们认为各大陆并非一直在它们现在所处的位置。既然过去的位置与现在的位置不同，所以谈论过去情况用一般过去时。
4.lead to 导致 meet with经历 come to 来到 run across 似乎没有这个说法把
5.由 “for almost one week 可知用完成时 又悉宴升由句意可知用过去完祥漏成进行式
由now we 可知 用现在进行时

Answer 2

32342

Answer 3

2
2
3
4
1

Answer 4

42241

Answer 5

22341提示：a number of相当于some