His grandfather has kept reminding him not to _______ with bad companions whether in school or in society.
| A．associate | B．conduct | C．distinguish | D．participate |
Without the ‘ greenhouse effect’, the earth ____ be about thirty-three degrees Celsius cooler than it is.
| A．should | B．would | C．will | D．must |
During the Middle Ages, a conventional artist was not interested in showing nature and people _____they really were.
A. who B what C. like D. as
________volcanoes now for many years, I am still as enthusiastic about my job as the first day I first______.
| A．Studied, started | B．Have studied, started |
| C．Having studied, started | D．Having studied, starting |
Film has a much shorter history, especially when ______ such art form as music and painting.
| A．having compared to | B．comparing to | C．compare to | D．compared to |
By _____ coincidence, oil paints were developed at the time when ____technique of perspective was used.
A. a ; the B \ ; a C. \; the D. a; a