Put the verbs in brackets into the present simple or the present continuous (steven|play)tennis right now? No,he (study)at the library.2How often (you|go)to the gym? I(exersise)twice a week. 3 Carol (need) new shoes. OK.(she|want) to go shopping now? 4 I (look) for Marsha (you know) where she is? i (think) she is at the games arcade. 5 (you|play) basketball at the sport centre on Satudays? Yes,i (go) there right now.6 George never(clean)his room.Why it`s so messy! 7 Tonya always (cooc)dinner for us in the evenings.Yes,but today she (visit)a friends.

Вот правильные формы глаголов:

1. Is Steven playing tennis right now?
   No, he is studying at the library.

2. How often do you go to the gym?
   I exercise twice a week.

3. Carol needs new shoes.
   OK. Does she want to go shopping now?

4. I am looking for Marsha.
   Do you know where she is?
   I think she is at the games arcade.

5. Do you play basketball at the sports centre on Saturdays?
   Yes, I do. In fact, I am going there right now.

6. George never cleans his room.
   That’s why it’s so messy!

7. Tonya always cooks dinner for us in the evenings.
   Yes, but today she is visiting a friend.

Если кратко по правилу:
Present Simple используется для привычек, регулярных действий и состояний: go, exercise, need, know, think, cleans, cooks.
Present Continuous используется для того, что происходит сейчас: is playing, is studying, am looking, am going, is visiting.