We are going to walk the lake and see the ducks. A.about B.aroud C.on
( ) He lives in a village _____there are a lot of trees.
( ) The teacher told us that the sun ____in the east.
( )In the past he often made his sister____, but now he is often made ___by his sister.
( ) What do you think ______solve the problem?
( ). _______ is the most interesting of _________.