Fill in the blanks by choosing the most appropriate option.
Ruskin Bond (a)__________ spend his summer (b)__________ his grandmother's house in Dehradun. While taking the train, he always (c)__________ pass through a small station called Deoli. No one would get down at the station and nothing (d)__________ there. So he felt bored.
(a) 1. has to 2. have to 3. used to 4. Is to
(b) 1. in 2. at 3. with 4. on
(c) 1. had to 2. have to 3. might 4. is to
(d) 1. happened 2. has happened 3. happens 4. does happen