When _________ where he had put the book, he kept silent.
| A．ask | B．asking | C．to ask | D．asked |
Police have found________appears to be the lost ancient statue.
| A．which | B．where |
| C．how | D．what |
He wrote a letter________he explained what had happened in the accident.
| A．what | B．which |
| C．where | D．how |
Nowadays people are more concerned about the environment________they live.
| A．what | B．which |
| C．when | D．where |
Happiness and success often come to those________are good at recognizing their own strengths.
| A．whom | B．who |
| C．what | D．which |
Mo Yan was awarded the Nobel Prize for Literature in 2012，________ made one of the Chinese people’s longheld dreams come true.
| A．it | B．that |
| C．what | D．which |