There is no doubt _______international cooperation is the key to dealing with cyber crime.

Please turn off the light.— OK, Mom. I won’t leave the room ______ the light _____.

_Who is _____ English teacher, Lu Yu_ Mr Tian teaches _______ English.

We’re expecting Jerry because he’s our_________ visitor who comes here for holiday every summer

I am a student. I usually _______at 4:30 p.m..