China is ( ) by the world for its Great Wall.
A.known well
B.well known
C.well know
D.well knew

单项选择题Xiao Ming is( )about everything and keeps asking questions.A.stubbornB.interestedC.curiousD.addicted

单项选择题Your words in the opening ceremony is very (

单项选择题More and more people come to realize how important the ecosystem is and ( ) the activities to protect the environment.A.take partB.participate inC.involveD.participate

单项选择题The park was filled with people ( ) on their cell phones.A.to talk B.talked C.talk D.talking

单项选择题You could have ( )your spare time much better if you had planned well.A.employedB.hiredC.masteredD.managed