Give the correct verb forms.

People use a tooth sensor

(detect) any bacteria causing cavities, or any other infections in your teeth.

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“Where’s Tony?” “He ______ to the travel agent, and he hasn’t come back.”

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We ______ in Hanoi for a long time.

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I’d like to see that football match because I ___ one this year.

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I can’t believe that you ______all the three exercises. You just started five minutes ago.

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Up to now, the discount ______  to children under ten years old.

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Tom often watches TV after his parents ______ to bed.

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Their children ______  lots of new friends since they ______  to that town.