411.It seems to me that there is more to education than merely learning from teachers and textbooks.
412.The maintenance of sth is futile.
413.Being traditional is quite different from being out of date.
414.Animals play a vital role in maintaining the subtle balance of the earth's ecological system.
415.Therefore, to some extent, killing animals is equal to digging our own graves.
416.Pigs are used in the battle against drugs.
417.It's noticed that citizens live longer if they keep pet after their retirement.
418.For our own future benefit, please do treat sb with love and care.
419.Sth has led to some unfavorable results.
420.joint activities between relatives
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