So difficult____it to acquire a large vocabulary without the help of a teacher that he was close to giving up .
| A．he have felt | B．have he felt |
| C．he did feel | D．did he feel |
We've got two TV sets, but we still can't watch anything because ______ works properly.
| A．neither | B．either | C．each | D．none |
--- Did you find the pen yesterday?
--- No, I didn’t find ________, but I have bought ________.
| A．it; it | B．one; it | C．it; one | D．one; one |
All of us want very much to see these amusing movies，especially you referred to just now．
| A．any | B．it | C．the one | D．one |
______ has already been pointed out, only by correcting mistakes, can you make progress.
| A．It | B．As | C．That | D．What |
I will appreciate ______ if you can give me a hand.
| A．this | B．that | C．it | D．one |