—________ when has the country been open to international trade?
—1978，I suppose.
| A．Since | B．In | C．From | D．After |
Traditionally, college students hold a graduation ceremony to encourage themselves before they _____ on their life journey.
| A．give up | B．settle down | C．get through | D．set off |
Was it in the village _____ we used to live in _____ the accident happened?
| A．where; that | B．which; that | C．that; where | D．where; which |
Animals are obviously _____ lower form of life than _____ man.
| A．/; / | B．the; the | C．a; the | D．a; / |
The president of the World Bank says he has a passion for China, ______ he remembers starting as early as his childhood.
| A．that | B．which | C．as | D．when |
_____ according to the instructions, the robot can behave like a human being with average IQ.
| A．When to operate | B．When operating |
| C．When to be operated | D．When operated |