David, could you tell me _________?– Every four years.

Turn the radio ______, please! The baby has just fallen asleep.

Why haven’t you asked her to come here?— She _______ an important experiment when I found her and she _______ it.

Why are you standing, Alice?—I can’t see the blackboard clearly. Two tall boys are sitting _______ me.[ ]

The teacher said that light ________ faster than sound.