— David, could you please tell me ?— Every four years.
He couldn’t ________an answer when I asked him why he was late.
— Mrs Black is an organized housewife. —That’s right. Everything in her house is always ________.
The railway _______ Qinghai to Tibet is the longest plateau (高原) railway in the world.
Your mobile phone is so good. Where did you buy _____? I want to buy____ too.
— Our monitor Jack is good at all the subjects, but he never ________. — What a modest student!