We can get fresh water from rain, from rivers, or from ________ the ground.
| A.across | B.under | C.over | D.off |
—Would you mind turning _______ the music? Your father is sleeping.
—Sorry. I’ll do it right away.
| A.up | B.down | C.on | D.in |
—Let’s get the key ______ the question? —OK. Let’s start.
| A.for | B.with | C.on | D.To |