The moffered him their help.

he word “ PM2.5” _________ appearing in media reports, people pay greater attention to it and seek health tips for smoggy days.

The 20th century________ many new means of communication，like radios, televisions, telephones and the Internet.

Excuse me， could you tell me _____ —Certainly. At a quarter past two in the afternoon.

Driving less, walking more is good for our health.–So I’d rather __________ an hour’s walk to work than consider __________a car.