—I had been working till 4∶00 a.m. to prepare a report for my boss.—________you look very tired.
He hasn't come yet.What do you consider _______ to him?
Unfortunately, when I dropped in, Doctor Li _____ for Beijing to join in the fight again SARS, so we only had time for a few words.
Children’s brains can’t develop properly_______ they lack protein
This is the very toy car ________ which he came here the other day.
I began to fish before memory began, _______ I know I have always fished.