Question

This door …. when there are not many people in the shop 1)close 2)closed 3)was close 4)is closed

Answer 1

This door is closed when there aren't many people in the shop.

3)is closed

Я вам скажу что "is closed" правильный вариант на 100%, не ищите в интернете там неправильные ответы.

Answer 2

The correct answer is:

4. is closed

So the sentence would be: "This door is closed when there are not many people in the shop."