Shall we go and ______hello to foreign teachers? —-Good idea! Let’s go.

His aunt’s letters ________ memories of thosebeautiful days when they used to live together in his hometown

It is not polite ____ in public places.

Some people who don’t like to talk much are not necessarily shy; they __________ just be quiet people.

ural disasters happen one after another, ______ warns man to treat naturekindly