r, at times this balance in nature is disturbedby human activities, _______ a number of possibly unforeseen effects

It was from the third floor of the teaching building ______ Tom shouted to me, “Wait till I set off.”

He often takes this road to avoid ______ the troublesomeboy.

Mum, do you mind my to music for a while—Of course not. But please to it with your earphone.

You are always full of_________ . Can youtell me the secret—Taking enough exercise every day.