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

The mother looked at the door _______，expecting the children’s coming．

 I won’t buy the house, which was too expensive and too big. ______, I’d grown fond of our little rented house.

--- In what way will you use your portable computer?--- I’ll use it _____ for giving lectures at home and abroad. 

----You look tired, Jack. ----I feel quite rested, _______.