Here are the correct words for each sentence:

1. until
2. at
3. On
4. at
5. doesn’t
6. finishes

So, the sentences would read:

1. We have English lessons **until** 11.30 a.m.
2. The meeting starts from 7 a.m. **at** 10 in the morning.
3. **On** 1st May, we often celebrate with a party.
4. Do you like hanging out with me **at** 9 tonight?
5. The knitting lesson **doesn’t** start until 9 a.m.
6. The cycling club **finishes** at 10 p.m.