根据短文内容，用方框中所给单词的适当形式填空，每词限用一次。

When you laugh, you will open your mouth and show your teeth. The healthier those teeth are, the happier you look. Why is that? It’s 　 81　 your teeth are important in many ways. If you take care of them, they’ll help to take care of you. Strong, healthy teeth help you eat the right food to make you grow. They also help you speak　 82　 .

You can take care of your teeth by doing like these:

　 Brush your teeth 83　 a day before breakfast and before bedtime.

Brush all of your teeth, not just the front ones.

　 　 84　 your time while brushing. Spend at least 3 minutes each time you brush.

Learn how to floss（用牙线清理）your teeth, which is a very important way to keep them healthy.

　 Brushing and flossing keep your teeth healthy. You also need to 　 85　 about what you eat and drink. Eat a lot of fruits and vegetables and drink water instead of drinks.

根据下列句子中所给的汉语提示，写出英语单词的正确形式。每空限填一词。

66. The young man with glasses teaches　　　 (我们) Chinese.

67. He　 ___ (做) his homework late last night.

68. There are many　　　 ___ (公园) in Hangzhou.

69. Who’s　　　 ___ (高), Lucy or Lily?

70. Ann had her　　　 (十) birthday in China. She felt very happy.