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____ miss the concert tonight．It is a good chance to see many famous singers．
A．Not be sure to
B．Be not sure to
C．Be sure to not
D．Be sure not to
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It doesn't matter when or how much a person sleeps, but everyone needs some rest to stay alive. That's 1 all doctors thought, until they heard about AL Herpin. AL Herpin, it was said, never slept. Could this be 2 ? The doctors decided to see this 3 man themselves. AL Herpin was 90 years old when the doctors went to his home in New Jersey. They thought for 4 that he got some sleep of some 5 . So they stayed with him and watched every movement(行为) he 6 . But they were 7 . 8 they watched him hour after hour and day after day, they never saw Herpin 9 . In fact, he did not even 10 a bed. He never needed one.
The only 11 that Herpin sometimes got was sitting in a comfortable chair and reading newspapers. The doctors were 12 by this strange continuous(不断) sleeplessness. They asked him many questions, 13 to find an answer. They found only one answer that might explain(解释) his condition(状况). Herpin 14 some talk about his mother having been ill several days before he was born. Was this the 15 reason? No one could be sure.
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先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整，所填单词必须完整写出。
Your mouth will be opened and your teeth will be shown when you laugh．However, the h (1) those teeth are, the happier you look．Strong, healthy teeth can help you eat the right food to help you g (2) ．They also help you speak clearly．But do you know how to take care of your teeth? These should be f (3) ．
Brush your teeth twice a day after breakfast and before bedtime．If you can, brush after lunch or after eating sweet cakes．T (4) your time while brushing．Spend at least 3 minutes each time you brush．Brush all of your teeth, not just the f (5) ones．Spend some time on the teeth along the s (6) and in the back．
Be sure the t (7) you use is soft and should be changed every three months or even less．
Learn how to floss(用牙线清理)your teeth, which is a very important way to keep them healthy．It feels s when you do it at first, but soon you'll get used to doing it．The floss cleans up food that's h (8) between your teeth．
Brushing and flossing keep your teeth healthy．You also need to c (9) about what you eat and drink．Eat lots of fruits and vegetables and drink water i (10) of drinks．