. It never occurred to humans until the mid-l990s _______some animals can be cloned.
| A．where | B．that | C．when | D．what |
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 |
The president of the World Bank says he has a passion for China，________he remembers starting as early as his childhood.
| A．where | B．which |
| C．what | D．when |
The museum will open in the spring with an exhibition and a viewing platform ________ visitors can watch the big glasshouses being built.
| A．what | B．where |
| C．when | D．why |