19/ The Suwannee River has been neverimportant for transport and no significanthydropowerpotential. important for - im portant to :"<
20/ American manufacturers depend on ocean shipping for most of trade with other countries.
of trade - trade
21/ The root of the chicory plant is oftenground up and added tocoffee to elimination its bitterness.
elimination - eliminate
22/ Some nematodes are very tiny that it is necessary to view them through a microscope.
very tiny - so tiny
23/ It is estimated that a scientific principle has a life expectancy of approximately a decadebefore it drastically revised or replaced by newer information.
drastically hoặc life expectancy - em đoán life expectancy 8-}
24/ He was stopped each dozen yards by friends who wanted to congratulate him. each - each of ạ Ngoài tầm :"> @ anh gọi anh là đúng rồi ạ :| em 13 mà anh :| Gọi cậu tớ để em chêt già ạ 8-}