根据句意及汉语提示完成下列句子。

1. Luck 52            the people who want to show themselves            (给……提供……) a good stage.

2.            (多亏……) the modern communications, we can keep in touch with our friends and relatives far

   away easily.

3. China has            great            (取得进步) in sending man-made satellites into space.

4. Our new headmaster looks very young. I think he is            (少于) thirty years old.

5. Mike is weak in English. In order to            (赶上) others, Mike works harder than before.

用有刻度的牙周探针探测牙周袋的注意点，不包括（）

A.支点应稳

B.探测力量应掌握恰当

C.探测宽度要角度垂直

D.探测位置和角度要恰当

E.按顺序探测