With the word “PM2. 5” constantly __________ in media reports, you might be wondering what on earth it means.
You may have no idea _____ you will be doing ten years from now.
_______________, we don’t have much spare time at the moment.
It is the education _____ he received when studying abroad _____ has made him such an excellent manager.
--Mum, I’m going to visit my uncle. What about staying there a week? --A week is too long. Try to be back in a _____ of days.
He was driving a lorry load of bananas ____he came off the road at a bend and fell into the valley.