Here are the correct forms of the verbs for both exercises:

**Ex1. Choose the correct form of the verb, singular or plural.**
1. Why **isn't** there a supermarket close to those cities?
2. One of your kids **has** lost a shoe.
3. Her cat as well as her dogs **likes** fast food.
4. The staff at the school **wasn't** happy with their working condition.
5. Every man, woman, and child **is** protected under the law.

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**Ex2. Complete the sentences with is/are, has/have, or does/do.**
1. Neither the library nor the bookstore **has** the book I need.
2. Tom as well as his two close friends **is** not in class today.
3. Both Ron and Bob **have** passed the exam successfully.
4. One of the staff **has** to report the problem to the manager.
5. Either the girl or her parents **are** going to be present at the party.

If you have any more questions or need further assistance, feel free to ask!