---Have you heard of Earth Day?
--- Yes, We have only one Earth. We have no choice but ________ it.
A. protect B. protected C. protecting D.to protect
---Could you tell me ______?
--- By searching the Internet.
A. how you got the information B. why you got the information
C. how did you get the information D. why did you get the information
--- I really don’t know how ________ this problem.
--- Let me see.
A.to do with B. to deal with C. doing with D. dealing with
--- Excuse me, when and where will the next Olympic Games take place?
--- The 31st Olympic Games _______ in Rio de Janeiro, the capital of Brazil in 2016.
A. held B. will be held C. will hold D. have been hold
---Look! Such heavy traffic!
--- I doubt _________ or not I can get to school on time.
A. if B. when C. whether D. why
--- Our school is so beautiful.
--- Yes. So our teachers ______ at school to enjoy its beauty.
A. prefer to stay B. prefer staying C. prefer to staying D. prefer stay
