A NASA experimental jet , the X-43A,flew at a world –record speed ---11,260 kilometres an hour on November 17.This speed is __ as that of sound.
When I entered the classroom, I saw Mary ______ at the desk and ______ a letter.
He remained calm ________ nothing had happened,______ astonished all of us.
She always finds _____ a waste of money and time ______a day dream in school. that; to dream B. this ; to dream C. its; dreaming D. it ; dreaming
________ will be in charge of the project______ been decided yet.
______worried the child most was _____ to visit his mother in the hospital.