Computers first came into use ________.A. in 1950s B. on the 1950s C. in the 1950s
I have ________ rules in my home.We have ________ homework to do today.
Remember ________ off the lights when you leave the room,please. A.to turn B.turning C.turn
—What’s your teacher like? —She is always strict ________ us. A.in B.with C.to
—What do you usually do in the morning? —I often practice ________ English. A.speak B.to speak C.speaking
He has to be ________ bed ________ nine o’clock.