С, . open the parentheses: 1. i (to do) morning exercises. 2. he (to work) at a factory. 3. she (to sleep) after dinner. 4. we (to work) part-time. 5. they (to drink) tea every day. 6. mike (to be) a student. 7. helen (to have) a car. 8. you (to be) a good friend. 9. you (to be) good friends. 10. it (to be) difficult to remember everything.

А в каком времени нужно поставить не уточняется?
Если в Past Simple, то так:
1 - did, 2 - worked, 3 - slept, 4 - worked, 5 - drank, 6 - was, 7 - had, 8 - were, 9 - were, 10 – was.

Если в Future Simple, то так:

1. I will do morning exercises. I wont do
2.He will work at a factory. He wont work.
3.She will sleep. She wont sleep.
4.We will work. We wont work.
5.They will drink. They wont drink.
6. Mike will be. Mike wont be.
7. Helen will have. Helen wont have.
8.You will be. You wont be.
9.It will be. It wont be.