In the following questions, the lst and the last sentences of the passage are numbered 1 and 6. The rest of the passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence and find out which of the four combinations is correct. Then find the correct answer.
1. The ever spiralling costs
P. to take another look
Q. at the plant remedies
R. of modern synthetic drugs
S. may force western medicine
6. used by the Third World Countries
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