Ihavebeenstudyinghereforfouryears,bynextsummerI________.

A beam of light will not bend round corners unless ________ (make) to do so with the help of a reflecting device

This diploma ( 毕业文凭 ) ________ that you have completed high school.

Night ________ (fall), we hurried home.

He________methathedecidedtoleaveonMonday.