Studies show that the things that contribute most to a______of happiness cannot be bought.
Many students go to school _______ the tube in Beijing every day.
Stop making noise, _______ the neighbors will start complaining.
-- How was your life in the countryside? -- It was _______ but sometimes I felt a bit _______.
-- Have you moved into your new house? -- Not yet. The rooms _______.
Make sure you get enough sleep and don’t make yourself so ______ !