The retired teacher is in his mid-seventies —seventy-six to be _______.

However，at times this balance in nature is _______ resulting in a number of possibly unforeseen effects.

He shouldn’t have been so     about food, otherwise he would be healthier now.

—Why is your wife wearing a mask in such good spring?—Because she is_________ to flowers.

My car’s performance is ___ since the engine’s been tuned and the tires have been changed．