g down the street, she noticed a long_____ of houses, all exactly alike.

Many young people usually offer their seats to the old on the bus.-That’s good. The old should be ______.

tired professor, _____ in his new book in thepast three years, hasn’t realized the decline in his health.

Mary often does some translation work to earn extra money, which ________ half of her income. [ ]

It was ______ that they all went swimming in the river.