He has read many books about China, so it's ________ for him to answer these questions about China.
A.difficult B.lazy C.easy D.serious
Steven has invented a treeplanting machine. He is so________．
A.honest B.smart C.private D.boring
It's dangerous to walk too fast on ________ days because you may fall down and hurt yourself.
A.sunny B.cloudy C.windy D.snowy
We should study in a ________ method, or it may be a waste of time.
A.similar B.proper C.natural D.magic
There is a smile on Mr. Brown's face. He must be________ with our homework.
A.lucky B.sad C.bored D.pleased
It's ________ to stick your chopsticks into your food while having a meal.
A.kind B.polite C.rude D.warm
