—Your bag is very nice.— .
They thought ________ important to look left and right when ________ the road.
The guide said that much attention must __________ these details.
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.