______, the conference began.
| A．The candidates having taken their seats |
| B．The candidates had taken their seats |
| C．Taken their seats |
| D．Taking their seats |
The house you have just bought is ___ mine.
| A．as three times big as | B．three times the size of | C．three times the size than | D．as big as three time that |
---How many eggs are still there in the fridge, Bill? --_____.
| A．No one | B．No | C．Not | D．None |
About ___ of the teahers is our school ___ young people under thirty.
| A．two-five, are | B．second-fifth, is | C．two-fifths, are | D．two-fifths, is |
___Mr. Chen is waiting outside to speak to you. He appears to be quite ___ important person.
| A．/, an | B．A, an | C．The, the | D．The, / |
Suan! Where have you been? You have no idea ___ worried I was !
| A．how | B．what | C．that how | D．what |