Put the verbs in brackets in the correct verb tense: the Present Perfect or Past Simple

I (not see)

your brother yet.

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We have Math___________ Tuesday and Friday.

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We help families in ________ by providing food, clothing, housing and much more. 

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American students take part___________ different activities after school.

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Nam is interested in___________ experiments in his free time.

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                     people usually live on the streets, under bridges, or in camps.

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How……do you go swimming after school? – Once a week.

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If you want to _____ weight, you should follow a low-fat diet.