Simple Present exercises online

Fill in the words in brackets in the right form in Present Simple tense to complete the following sentences in English.
1. There many people in Warsaw. (be)
2. I do my lessons. (must)
3. He an English citizen. (be)
4. Their brother a good son. (be)
5. They speak French. (can)
6. My friend many interesting books. (have)
7. Mary read Russian books. (can)
8. It so dark that I see nothing. (be / can)
9. We tell you the truth. (can)
10. We time to play. (have)