Read the following passage and fill in each blank with words chosen from options given.
It’s a magical sight: Just as the light begins to vanish, thousands of tiny penguins waddle ______ (1) the surf on an island in south-eastern Australia, then ______ (2) the beach and along well-worn paths toward ______ (3) burrows. The “Penguin Parade” has been a major attraction since the 1920s, when tourists ______ (4) by torchlight to view the nightly ______ (5) the birds — the world’s smallest penguin breed, with adults, ______ (6) 13 inches tall. For much of that time, the penguins lived ______ (7) the residents of a housing development, in tight proximity to cars and pets. The penguins’ numbers fell ______(8) But in 1985, the state government decided to buy ______ (9) piece of property on the Peninsula and return the land to the penguins. Today there are about 31,000 penguins ______ (10) on the peninsula, up from 12,000 in the 1980s.
Select the most appropriate option to fill in blank No. 4