An old scientist whom everybody in England knows very (well, good)

An old scientist whom everybody in England knows very (well, good) is travelling (on, by) train. The ticket-collector (is making, makes) his round. When he comes to the scientist and asks him for the ticket, (the, an, -) old man begins to look (at, for, though) it in his pockets, in his bag and suitcase, but (cannot, may not, must not) find it anywhere.quot;(There, It) doesn39;t matterquot;, says the ticket collector, who knows the scientist very (well, good).quot; There, is no hurry. I (may, can, should) come again (at, on, in) the next stationquot;. quot;Oh! But I (can, must, could) find itquot;, says the old man (helplessly, helpless). quot;I want to know where I (go, am going)quot;.