In the following passage, some words have been deleted. Fill in the blanks with the help of the
options given. Select the most appropriate option for each blank.

Suraj waved to a passing train, and kept waving (1)______ only the spiralling smoke remained. He (2)______ waving to trains. He wondered (3)______ the people in them, and about (4)______ they were going and what it (5)______ be like there. And when the train had passed, Suraj was lonely.