_____entering the classroom, remember to take your seat and turn off your cell phone.
| A．At | B．From | C．Upon | D．As |
There were 20 people sitting in the room, half ___ were women.
| A．of whom | B．of which | C．about that | D．about whom |
---How __ is it? ---It's not __. It’s only two miles ___.
| A．far, away, far | B．far, far, away | C．far. Far. Far | D．away, away, away |
It rained heavily yesterday,___, he didn't turn up at the meeting.
| A．As a result | B．As a result of | C．First of all | D．Instead of |
The story happened ___ a cold winter day.
| A．in | B．on | C．at | D．/ |
That’s __ I can tell you.
| A．all which | B．all what | C．that | D．all that |