________ 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
The sun began to rise in the sky, ________ the mountain in golden light.
A. bathed B. bathing
C. to have bathed D. having bathed
Lionel Messi ，________the record for the most goals in a calendar year，is considered the most talented football player in Europe.
A．set B．setting
C．to set D．having set
Laura was away in Paris for over a week.When she got home, there was a pile of mail ________ for her.
A．waited B．to wait
C．waiting D．was waiting
