_____ is no possibility to visit the factory, for the rain is so heavy.
| A．It | B．There | C．That | D．This |
____ by the advances in technology, many farmers have set up wind farms on their lands.
| A．Being encouraged | B．Encouraging |
| C．Encouraged | D．Having encouraged |
Some people skip meals or eat only tiny amounts of food and may have conditions ______ rob the body of the nutrients ______ needs to grow and stay healthy.
| A．which…it | B．that…that |
| C．where…that | D．where…it |
Fireworks, ________ of gun powder or flash powder _______ in a tight paper tube, make the big flash or boom effect.
| A．consisting…wrapping | B．consisting…wrapped |
| C．consisted…wrapped | D．being consisted….wrapped |
In the past few years, research has suggested that Vitamin D may increase the level of serotonin（血清素）, one of the key nurotransmitters influencing our mood, and ________it helps to relieve mood disorders.
| A．that | B．where | C．what | D．which |
Chinese must have the largest number of speakers, ________ ?
| A．mustn’t that | B．haven’t they |
| C．don’t they | D．doesn’t it |