_______I had time, I would have visited the beautiful lake again.
| A．If | B．Unless | C．Had | D．When |
_____ the general state of his health，it may take him a while to recover from the operation.
| A．Given | B．To give | C．Giving | D．Having given |
Helen was much kinder to her youngest son than to the others， _____，of course，made the others envy him.
| A．who | B．that | C．what | D．which |
Boris has brains. In fact，I doubt whether anyone in the class has ____IQ.
| A．a high | B．a higher | C．the higher | D．the highest |
Yesterday Jane walked away from the discussion. Otherwise，she ____ something she would regret later.
| A．had said | B．said | C．might say | D．might have said |
An awful accident_____，however，occur the other day.
| A．does | B．did | C．has to | D．had to |