?May? shows slight possibility, and the speaker is not certain of his arrival therefore none other option follows other than (a). Will means being certain about future. Shall is used to express something that is inevitable. Does means to execute something.
Slipped means to move with a smooth sliding option. Option-a drawn means showing effects of tension, pain or illness, the consequence of growth cannot always be low, so we cannot choose crept. Crept means to go very slowly, percolated means passed through a medium, therefore only option-2 follows.
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