Smoking is one of the ______ cause of cancer, killing millions of people each year.
| A．major |
| B．similar |
| C．appropriate |
| D．casual |
In our class there are 46 students,half wear glasses.
| A． | in whom | B． | in them | C． | of whom | D． | of them |
Before driving into the city, you are required to get your car.
| A． | washed | B． | wash | C． | washing | D． | to wash |
They are living with their parents for the moment because their own house ____.
| A．is being rebuilt | B．has been rebuilt | C．is rebuilt | D．has rebuilt |
If you happen to get lost in the wild, you’d better stay ______ you are and wait for help.
| A．why | B．where | C．who | D．what |
-Did you catch what I said?
-Sorry. Ia text message just now.
| A． | had answering | B． | have answered | C． | would answer | D． | was answering |