It's necessary to ____) pay to travel on the bus.It wasn't necessary to (____) wear a seat belts 50 years ago. It's necessary to (____) practice to be a good soccer player It was mandatory to (____) call male teacher as MR. when you were young. It's important not to (____) wear those slippers outside. It isn't mandatory to (____) wear a watch to school.

TEENS 3 1.1 GRAMMAR PRACTICE

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