What impresses me most is ______ he appears in front of others, he wears a sincere and charming smile.A.which B.that C.where D that whenever
___ the room,the nurse found the tape-recorder ___.
We can never forget the days _______the two astronauts in spaceship worked together and the days _______we spent together.
Who is________the fire in the kitchen?
Only when he told me________what trouble he was in.
The doctor suggested he_______with a serious disease and that he______to hospital at once.