No one_______ be compared with Messi in playing football. — Oh, you are really his big fan.

Everyone knows that________ is dangerous to play with fire, but________ is difficult is to prevent children from playing with fire.

Noise is unpleasant, _____ when you are trying to sleep

When will Mr.Brown be back to China — Sorry, I don’t know ________.

at down opposite each other, but itwas some moments ______ they spoke