Here are the answers for the questions based on the provided text:

**Question 21:** D. Tom asked his classmate if he is joining them for the party that weekend.

**Question 22:** B. Unless it rains, we won't have to cancel the game.

**Question 23:** A. We start learning English 6 years ago.

**Question 24:** C. In spite of intelligence, she doesn’t do well at school.

**Question 25:** C. Jennifer is reading an interesting book that you lent her last week.

**Question 26:** A. Before my father went to work, he had locked all the doors.

**Question 27:** A. She is very pleased that she has met her brother after a long holiday.

**Question 28:** A. Jack wishes he does not have many friends. He would like to have more friends.

If you have any further questions or need clarification on any answers, feel free to ask!