．______, I think, and all the problems could be settled．
| A．If you make more efforts | B．Making more efforts |
| C．A bit more efforts | D．To have made more efforts |
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 |
The door _____ open, no matter how hard she pushes.
| A．doesn’t | B．can’t | C．won’t | D．shouldn’t |
When I first met Doris I didn’t like her, but I ______ my mind.
| A．have changed | B．change | C．had changed | D．would change |