In the factory, the helmets the workers wore varied _____ color according to their different posts.
A．from B．in C．with D．alongside
The medicine bought at a high price turned out to have no _____.
A．influence B．result C．effect D．risk
Please tell me how global warming _____. I am still in the dark.
A．came by B．came out C．came to D．came about
It is high time that we ____ the amount of carbon dioxide in our daily life.
A. reduce B reduced C will reduce D reduces
It rained that day and ___ the baseball game was called off.
A．however B．still C．so D．consequently
It is not until the disease has progressed to AIDS ____a person begins to look sick.
A．who B．that C．where D．before
