______ he works hard,I don't mind when he finishes the experiment.
Mr Smith is at the door. _______ wants to see you.
I’ve no idea. I just pretended nobody was at home, so I didn’t ask who _______ was.
I dislike _______ when others laugh at me in public or think poorly of me behind.
Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.
. ------Don’t put the waste on the ground. ------Oh, I’m very sorry. I ____ the dustbin there.