Who taught you to use Wechat（微信）？
Nobody． I learned it by ___________．（ ）
A．IB．meC．myself
The old man，Bai Fangli，donated about￥350，000 to over 300 students he lived a simple life himself.（ ）
A．untilB．unlessC．becauseD．though
一Why do you choose to use Beidou Navigation （导航） Satellite System，Mr.Li？
一Because I think it has many advantages GPS （全球卫星定位系统）.（ ）
A．onB．inC．overD．of
—Sir，I have trouble doing the voluntary work for the 20th Games of Jiangsu Province in Taizhou.
一Don't worry.A lot of support soon.（ ）
A．is offeredB．will be offered
C．was offeredD．were offered
It's reported that， ，people with college education can make more money than those without.（ ）
A．in generalB．in publicC．in timeD．in all
一I often see the sign in schools.What does it mean？
一Students bring mobile phones to school.（ ）
A．needn'tB．can'tC．couldn'tD．wouldn't