Before Tom left home, his mother kept telling him to ____ his manners at the party.
Hill often attends lectures at Nanjing University , chiefly ____ his knowledge about hobbies .
.Saving resources is a basic policy of our country . And it proves _____ to its sustainable development .
._______ after a long walk , Mr Yang called and said he couldn’t come .
.It is ______ to spend money on preventing illnesses by promoting healthy living rather than spending it trying to make people ______ after they are ill .
As she lives quite near our school , she often goes to work on an electric bike ___ in her car .