_____ the environment is important for human beings.
We usually get up_____ six o’ clock ____.the morning.A. at, on B. at, in C. on, in
________ the help of the dog, people lost in snow found their way home.
It’s ________pleasure for me to be invited to play the piano at the concert.
-It sounds interesting. Can I join you?
- Speak louder, please.- _________