________ which university to attend，the girl asked her teacher for advice.
A. Not knowing B. Knowing not
C. Not known D. Known not
Volunteering gives you a chance ________ lives, including your own.
A. change B. changing
C. changed D. to change
_______ the course very difficult, she decided to move to a lower level.
A. Find B. Finding
C. To find D. Found
________ basic first－aid techniques will help you respond quickly to emergencies.
A. Known B. Having known
C. Knowing D. Being known
When we saw the road ________ with snow, we decided to spend the holiday at home.
A. block B. to block
C. blocking D. blocked
You cannot accept an opinion ________ to you unless it is based on facts.
A. offering B. to offer
C. having offered D. offered
