【单选题】() can help kill germs that could lead to disease.
【单选题】This medicine can help kill the _____.
【简答题】A.It can kill people. B.it can damage forests and plants. C.It can make it difficult to breathe. D.It can damage steel and concrete.
【单选题】—Do you think playing cards is beneficial to our study? —No,if ________,it can help us kill time when we have nothing to do.