用括号中所给单词的适当形式填空。

1. _________ (do) your mother have a computer?

2. That _________ (sound) interesting.

3. Our school _________ (have) a baseball team.

4. He has many balls in his room. Can you see _________ (they)?

5. My mother _________ (watch) sports on TV.

6. Let _________ (we) play volleyball.

7. You can join _________ (we) sports center.

8.We have many sports _________ (club).

物业服务企业将电梯维修保养业务外包时，承接外包的专业化电梯维修公司必须具备电梯维修相应的（）。

A.特种设备安装改造维修许可证

B.特种设备作业人员证

C.电气安装检查

D.电梯安全检验人员资格证书