I think ______ necessary ______ to take more exercise.

I want to know if your sister will go to the movie. — If your sister　　 , so 　　　.

Tell Jack I will wait for him at the school gate.—______ he doesn’t come?

do you have a face-to-face talk with your parent(s)?

I can’t believe my own eyes. The magician changes paper ________ money. [ ]