More and more people come to realize how important the ecosystem is and ( ) the activities to protect the environment.
A.take part
B.participate in
C.involve
D.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

单项选择题Xiao Li proposed we postpone the journey to next month and everybody disagree()him.A.to B.with C.on D.at

单项选择题( ) you are in the world, when you walk in to our hotel we want you to have best lodging experience possible.A.Whoever B.Whatever C.Whenever D.Wherever

单项选择题My father ( )his business successfully.A.experimentedB.conductedC.hostedD.manufactured