—John has put forward _______ most challenging question for us to answer.
—Yes, it really is. I have never heard _______ harder one.
| A．the; 不填 | B．不填; the | C．the; the | D．a; a |
______ interested us most was ______ he saw last night.
| A．It; what | B．What; what | C．What; how | D．It; how |
______ he has gone abroad is not true.
| A．Whether | B．When | C．That | D．Why |
We make ________ that whoever leaves last turns off the light.
| A．it a rule | B．a rule | C．the rule | D．a rule it |
_______ is certain that practice makes perfect.
| A．What | B．It | C．There | D．Anything |
With a lot of work _______, I can’t help you tonight.
| A．do | B．doing | C．done | D．to do |