• Underline the correct modal verbs:
    1) Scientists don't have to/must consider the dangers of cloning.
    2) People mustn't/don't have to be experts to operate a DVD player.
    3) You must/mustn't switch off your computer when it is not in use.
    4) She has to/mustn't be 20 years old now.
    5) You have to/mustn't be careful with electricity.
    6) People don't have to/mustn't take computer lessons to use a computer.
    7) John mustn't/has to study hard if he wants to become a robotics engineer.

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