When the big bills for mother's hospital care came, father was glad he had money in the bank to _____.
Please ___ your new watch, or you’ll get it lost.
You should ___ the lights if there is no one in the room.
Save water as ___ as we can.
--What’s the time ___ your watch?---On, my watch ___ “A quarter to five”
--____ did he send this letter to you? ---By mail