Many difficulties have ______ as a result of the changeover to a new type of fuel.
| A．risen | B．arisen | C．raised | D．arose |
Jim passed the driving test , ________ surprised everybody in the office.
| A．which | B．as | C．it | D．that |
The American girlfather is an engineer is my pen friend．
| A．who | B．whose | C．that | D．which |
Is some German friends visited last week ?
| A．this school where | B．this the school where |
| C．this the school | D．this school |
Winter is the time of the yearthe days are short and nights are long．
| A．on which | B．that | C．when | D．where |
--- What ______ when I phoned you?
--- I ______ my work, and I was about to go out．
| A．have you done; finished | B．were you doing; have finished |
| C．did you do; had just finished | D．were you doing; had just finished |