The tower ________very old ________ the Ming dynasty.
| A．looks；dates back to |
| B．which looks；dated back to |
| C．that looks；dated from |
| D．looking；dates from |
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 |
Greenland， _____ island in the world，covers over two million square kilometers.
| A．it is the largest | B．that is the largest | C．is the largest | D．the largest |