63. （）

By the middle of the 21st century, the vast majority of the world’s people____ in cities rather than in rural areas.

Robots have to become automatons that can truly learn because_______ .

He read a play of mine and, though he did not much like it, he thought it might just run for the six weeks till the play he had in mind could be produced.

66.（）

According to the passage, the two students failed in their study because of their

When he arrived in that country, he found that there is little occasion to speak Chinese.

According to this passage, a robot in the future can______ .

This is the very house____my grandpa lived before his death in 2010.

68.（）

57.（）

Since his wife died, he has ( ) himself into the research work.