I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.
| A．whom | B．them | C．which | D．whose |
The expo is being held in Shanghai, _______a lot of advanced technology is shown for the first time.
| A．why | B．which | C．when | D．where |
_______ is known to the world, the Chinese in many places _______ the old tradition.
| A．That; keep on | B．which; keep out | C．It ; keep back | D．As; keep up |
The company was willing to provide us with what we needed, _____ made us excited.
| A．what | B．it | C．which | D．that |
The worsening of global warming, _____human activities are to blame, has led to frequently extreme weather.
| A．by which | B．for which | C．that | D．what |
Jason will never forget about his 18th birthday, saw his being admitted to Harvard.
| A．when | B．which | C．that | D．it |
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