Many city people their bikes to work every day.

If there _____ an art exhibition in our city next week, our class _____ go and enjoy it.

We students should treasure the short senior school’s study life of three years. Once ________, the opportunity can’t get back.

Outside，the wind to pick up，and the rain started coming down even harder.

The man works hard ________ much money for his son. He wants his son to get a good education.