They communicate_____ each other _____ e-mail. [ ]

Do you know who took the students to the old people’s home, Tony?—Well, Mr. Smith _______.

Why not upstairs and have a look?

_________ no doubt that a green campus plays an important role in the growth of students, both physically and mentally.

Hi, Alice, Which do you prefer, 《Avenue of Stars》or《Mr. Zhou Live Show》? –_______, mother and I often watch them on TV.