Here are the correct answers with the necessary words added:

1. Add "is, are, a, an, some, any" to make a correct answer:
a. There **are** shoes under the chair.
b. There **are not** any pens on my desk.

2. Use given words to make complete sentences:
a. Are there **many** flowers in the museum?
b. What **store** is there next to the photocopy?