• 2021-04-14
    The state has stopped growing in population and may not( ) for some time.
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      The tooth ___________ by the dentist has been hurting me for some time.

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      It may take you some time to grasp the(communicate)_____skill.

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      It may take some time to get the British economy back___________.

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      He has stopped taking drugs now, but he may revert to.........................(take)them again.

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      Why does the existence of intermediate state in the 4-level laser can promote the production of laser beam? A: reach population inversion between ground state and metastable state B: reach population inversion between ground state and intermediate state C: reach population inversion between ground state and pumped state D: reach population inversion between intermediate state and metastable state