–__________do you exercise? – I exercise three times a week.
_____ Lisa _____ lily may go with you because one of them must stay at home to look after the dog.
---Lingling says Miss Yu has gone to Shanghai, _____ that be true? ---It _____ be true because I saw her in the office just now.
The two pictures look the same to me. It’s hard to _____ one from the other.
Food safety is important. Rules _____ to stop people from food pollution.
The old men are playing chess. Do you mind _____ the music a little?