. All of the guests ___________ by 9 o’clock , but the host _____________ until 15 minutes later .

 The new smart robot by Sony, with a camera “eye” on its head, can __________ colors and human faces.

By the middle of the 21st century, the vast majority of the world’s population _____ in cities rather than in the country.

--Is your uncle a pilot? --Yes. He _________ four days a week and has been to many places. 

 My father told me that we wouldn’t go anywhere this summer holiday if I ___pass the examination.