用should或shouldn’t填空，完成下列句子。

You ____ walk in the corridor. You ____ run.

You ____ talk in class. You ____ listen to the teacher carefully.

You ____ push your classmates. You ____ be kind to them.

You ____ be noisy or run in the swimming pool. You ____ line up.

You ____ always listen to the older people. You ____ talk loudly.

生物体结构和功能的基本单位是（      ）

根据短文信息，选择相对应的标题。

    Entertain yourself on cold wet days

    Getting bored on cold wet days? Feeling there is nothing to do? TEENS will help you get rid of the boredom. Here are some fun ideas to get you active, both inside and outside.

        ①  

    Help your mom cook a dinner in the kitchen. Washing vegetables may be a good choice for you. You can also learn to make a simple meal, like egg-fried rice. When you eat a meal you have cooked, you'll feel very proud.

        ②   

    Choose an interesting story. Then invite your friends to perform it together. You can be the director and your friends can be actors. When you are ready, ask your family and your friends' family to enjoy the play.

       ③   

    Collect your family photos. Choose some special ones with your family and make a photo wall. It's a great chance to listen to family stories behind those photos. You can also DIY a photo album and keep the photos safe for a long time.

        ④   

    Do you want to be an inventor? Be creative about finding new uses for old objects. Try to invent something with your imagination. For example, you can make a garbage can or a storage box with cardboard. You can also find a problem at your home and create something to fix it.