It’s ____for us students to make a plan for studying before the beginning of the new term.

Do you know the man ________ is reading the book over there?——— Yes, he is Mr. Green, our P.E. teacher.

she works hard ______ English and she does well ______ it. [ ]

What on earth are the police busy with?—They have been looking into how the plane crash _______.

Can a plane fly _____ the Atlantic Ocean?—Yes, but it needs to go _____ the clouds for hours. [ ]