you haven’t been acting like yourself. Everything is OK— .

If we can keep _____ this speed, we’ll arrive there in two or three hours

Sam, do you know when Alice ______to my party —I think she will come when she ______free .

The best way to prevent the air polluting _____ , but the sky is still not clear

Helen, can I wear jeans and a T-shirt to the evening party—OK. But a dress might be .