It             be the vocabulary that caused you the problem in the exercise because you know a lot of words.

It is nearly seven o’clock. Jack 　　　 be here at any moment.

– Whose ping pong bat is this? -- I’m not sure. I think it ______be Tom’s.

–I’m not good at English, Amy. What should I do?--You      practice it more. For example, you      read English every morning.

---- May I smoke here?--- If you      , choose a seat in the smoking section.