______ lots of times, the song doesn’t sound as nice as before.
| A．Hearing | B．To hear | C．Having heard | D．Heard |
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 |
Ellen was a painter of birds and of nature，__________，for some reason, had withdrawn from all human society.
| A．which | B．who |
| C．where | D．whom |