You ____ practice sports. You ____ skip meals. It is very important to make five meals each day. Mary ____ apologize for insulting Emma David ____ study if he want to pass the exams. He ____ avoid diets based solely on fast food. Toby ____ arrive home too late. His parents are very strict. He ____ brush his teeth every day They ____ eat five pieces of fruit every day. She ____ drink more water. It is good to stay hydrated. Children ____ eat food with so much sugar. It is bad for their teeth.

must, mustn't, should, shouldn't

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