Ответ:

  1. A: Why are you smelling (you/smell) that towel?
    B: It smells (smell) wonderful! What washing powder did you use?
    The verb "smell" can describe both an action (the act of smelling something) and a state (the characteristic smell of something). In the first sentence, it describes an action. In the second sentence, it describes a state.
  2. A: I am seeing (see) my niece tonight.
    B: I see (see). So you won't be coming to the cinema with us then, will you?
    The verb "see" can describe both an action (meeting someone) and a state (understanding). In the first sentence, it describes an action. In the second sentence, it describes a state.
  3. A: I hear you are looking (look) for a new job.
    B: Yes, it looks (look) as if I'm going to lose my present one.
    The verb "look" can describe both an action (the act of looking) and a state (appearing). In the first sentence, it describes an action. In the second sentence, it describes a state.
  4. A: We are thinking (think) of moving house.
    B: Oh, good for you! I think (think) that's a great idea!
    The verb "think" can describe both an action (the act of thinking) and a state (having an opinion). In the first sentence, it describes an action. In the second sentence, it describes a state.
  5. A: What's wrong with Tony? He is (be) usually so cheerful!
    B: I know. He is being (be) really moody today.
    The verb "be" can describe both a state (a permanent condition) and an action (a temporary behavior). In the first sentence, it describes a state. In the second sentence, it describes an action.