:高二英语必修三Unit5单元测试：Canada-The_True_North

　　C. rather than studying D. other than to study

　　13. It was reported that the passenger ship was sailing eastwards in the Atlantic Ocean ______ its

　　captain and some passengers on board_______ something supposed to be a UFO flying overhead.

　　A. while; caught sight of B. when; caught sight of

　　C. as; saw D. since; caught a sight of

　　14. –How do you keep in touch with your old classmates or schoolmates?

　　-- By chatting with them on the Internet, _______for three hours every day.

　　A. approximately B. averagedly C. mostly D. absolutely

　　15. Ten passengers ______ the plane, which crashed into the urban area last night because of

　　the thick fog, are reported to have survived the crash, but the news has not been ______ yet by the officials in charge.