Ответ:

15.

1. on

2. in

3. on

4. on

5. in

6. on

7. at

8. in

9. in

10. in

16.

1. they are working on a computer, during an internship

2. she person is running, in the morning

3. they are doing yoga, during class

4. they are writing, during the lesson

5. he is reading the book, during the search

6. they are going on their way, during the work time

7. she is drinking milk, during the breakfast

Объяснение:

простое настоящее время используется в 15 упражнение.

Удачи тебе!!