Here are the correct answers for each question:

1. **Question 17**: My younger sister usually **spends** four hours a day to practice speaking English.
- **Answer**: B (spends)

2. **Question 18**: I suggest that you **told** your friend to clear all the trash in the classroom before leaving.
- **Answer**: B (to clear)

3. **Question 19**: Every package must be **wrapped** carefully before it is **sent** to customers.
- **Answer**: B (be wrapped) and D (send)

If you need further explanation or assistance, feel free to ask!