几道高中英语单项选择,

几道高中英语单项选择,
高二上学期期末试卷
21.What troubles the farmers recently is existence of such insectswhich is a serious threat to the crops.
A.a B.the C.an D.不填
23.I thought my umbrella was lost.It that Jack took it by mistake.
A.turned up B.turned out C.turned in D.turned over
27.—Frankly speaking,the necklace you bought was notworth its value.
—Do you refer to witha diamond on it?
A.one B.it C.that D.the one
29.—Eric told me something great yesterday and
—What?
—He is going to marry next week.
A.then what B.guess what C.are you sure D.what do you think of it
33.Personally,you have no advantages over other candidates.If you are a bit older.
A.something B.anything C.nothing D.everything