.
Over the past decades, sea ice _____ in the Arctic as a result of global warming.
| A．had decreased | B．decreased | C．has been decreasing | D．is decreasing |
What the doctors really doubt is________ my mother will recover from the serious illness soon.
| A．when | B．how | C．whether | D．why |
Her question was so difficult that I could hardly make any ____ of it at all.
| A．explanation | B．meaning | C．sense | D．idea |
Despite the fact that Lucy is a lovely girl, she _____ be extremely difficult to work with sometimes.
| A．must | B．should | C．would | D．can |
Fitness is important in sports but of at least _____ importance are skills.
| A．fair | B．reasonable |
| C．equal | D．proper |
You’ve missed your ______ to speak and you have to wait for another round.
| A．turn | B．chance | C．order | D．opportunity |