Here is the second exercise. Thank you very much for the revision.
1) John ……………………… buy the dictionary for the exam: he can take mine.
2) You ………………………stand on the left on the escalators.
3) I ……………………… buy any butter, mum has just bought some.
4) I think you ………………………cycle on this road.
5) You ………………………leave your classroom without your teacher’s permission.
You ……………………… touch the ball with your hands when you play football.
I ……………………… leave Turin by six o’clock tomorrow.
6) Do you think I ………………………invite Mary to the end of exam party?
………………. you ever ………………..lend him your book?
#3 is a comma splice. Fix the punctuation.
Everything else looks fine.