Over the last three decades, the number of people participating in physical fitness programs ________ sharply.

n’t be able to come next week, because she_________ herself in Mount Tai then

When my parents were young, they had to ______ several miles every day to school since they had no money to buy a bike.[ ]

The desks and seats can be the height of a child.

There is no ________ over (在……上方) the river. We need to cross it by boat.