_____he entered the room,he picked up the phone and told the news to his parents.
A,At the moment B,Hardly C,The moment D,No soon
Whatever is left over may be put into the refrigerator，__________ it will keep for two or three weeks.
| A．when | B．which |
| C．where | D．while |
Mary was much kinder to Jack than she was to the others，__________，of course, made all the others upset.
| A．who | B．which |
| C．what | D．that |
The children，__________ had played the whole day long, were worn out.
| A．all of what | B．all of which |
| C．all of them | D．all of whom |
He wrote a letter __________ he explained what had happened in the accident.
| A．what | B．which |
| C．where | D．how |
She brought in her three friends, none of __________ I had ever met before.
| A．them | B．who |
| C．whom | D．these |