To live a low﹣carbon life, we must remember ____ the lights when we leave the room.( )
to turn off
turning off
not to turn off
My little sister_________ in the hall at that time yesterday.
Our English teacher _____________ to Martin when I entered the classroom this morning. A. is talking B. was talking C. talked
(2014)I great progress in my English study since last year.
Great changes in my hometown recently. A.took place B. happened C.have taken place
--- What are you doing here, Mrs. White? ---I'm waiting for my son. He________ back from school.