A.therefore
B.but
C.moreover
D.besides

A.beneficial
B.costly
C.valuable
D.worthy

A.would have joined
B.will join
C.had joined
D.would join

A.collect
B.gather
C.achieve
D.master

A.Soil pollution is reported to have posed a serious threat to the livelihood of many local farmers.
B.It has been reported that soil pollution has actually put many local farmers' lives at risk.
C.It is reported that the livelihood of many local farmers has led to serious soil pollution.
D.The livelihood of many local farmers was reported to be seriously endangered by soil pollution.

A.The workers at the factory shouldn’t wear protective clothing.
B.The workers at the factory must wear protective clothing.
C.The workers at the factory needn’t wear protective clothing.
D.The workers at the factory may wear protective clothing.

A.It’s my pleasure.
B.Oh yes, it’s very unfashionable.
C.Thanks. It’s very kind of you to say so.
D.You think so? I don’t like it.

A.harmful consequences
B.effective techniques
C.latest developments
D.useful experiments

A.harmful consequences
B.effective techniques
C.latest developments
D.useful experiments

A.finding
B.noticing
C.depriving
D.causing