_______ is part of children’s nature. They always insist on getting to the bottom of everything.

.一Where is Mike一He to New York on business. He the airport at 5 in the morning.

The data shows __________ successful peoplehave in common is _______ they have perseverance.

_______ nice weather it is today! The boysare playing _______ outside in the open air.

don’t think that John would __________ his friends if they were in trouble.