Mary had promised to give me a ticket for tomorrow. She failed, ____.
| A．either | B．though | C．but | D．too |
Is it a wonder that _____ little cells can store _____ much energy?
| A．such, so | B．so, much | C．so, so | D．such, such |
Not having worked out the problem, _____ leave the office．
| A．so he was not allowed to | B．and he didn’t want to |
| C．the teacher couldn’t make him | D．he couldn’t free himself to |
----Why isn’t Cathy here yet?
--- She _________ to be picked up at the station．
| A．could wait | B．must wait |
| C．might be waiting | D．can be waiting |
“ _____ to Michelle and having two beautiful girls in my house never allows me to look down upon women,” said Obama．
| A．Marrying | B．Being married | C．Having married | D．Married |
People tend to think that children’s IQ is _____ determines how well they are going to do in their future life．
| A．what | B．that | C．which | D．where |