Tianjin, __________ among the 10 cities with the worst air quality in the third quarter of the year, has shut down 440 high polluting factories since January this year.
Modern plastics can _________ very high and very low temperatures.
---What does PM2.5 mean? --- It’s a professional ______ indicating the condition of air pollution.
--- How are things going, Janet? --- They have set out to deal with the present situation ______ they think deserves their immediate attention.
--- Do you have the time? --- Yes. But... my watch is not very __________.
---How old can you guess your new English teacher is ? --- It’s hard to say. But I guess him to be _____between 35 and 40.