--- I rang you at about ten, but there was no reply.
--- Oh, that was probably _____ I was seeing the doctor.
| A．for | B．why | C．when | D．how |
The classroom is almost empty, where is _____?
| A．someone | B．anyone |
| C．everyone | D．no one |
Don’t go to _____ places where there is no fresh air.
| A．such | B．so |
| C．those | D．which |
Energy is ____ makes one work.
| A．what | B．something |
| C．anything | D．that |
I know nothing about the accident except _____ I read in the paper.
| A．that | B．for |
| C．what | D．不填 |
There he pointed to _____ looked like a stone and said that’s ______ you had to carry home.
| A．that, that | B．what, what |
| C．which, what | D．as, which |