— You always spend only a little time on your study. You really ____ me down.— I’m sorry, Mum. I won’t do that again.
– Whose ping pong bat is this? -- I’m not sure. I think it ______be Tom’s.
Eating too much ______ food is bad for your teeth.
—Would you like to go to see Liu Qian’s magic? --I’d like to, _____ you don’t want to go alone.
– His English marks are very high. -- Oh, really? How does he learn _____ a test?
–Why do you come back with nothing? -- I couldn’t buy the CD because I had______ money with me.