In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ 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/passage and find out which of the four combinations is correct 1. In summer tiny oysters are collected. P. Then each oyster is taken out and a small hole is drilled in its shell. Q. There they are kept for three years. R. A tiny piece of sand is put inside the oyster. S. They are placed in trays and planted in the sea. 6. Then the oysters are again left in the sea.