I stay at home _______ on weekends, but I don’t feel ______.
--- Which one did he choose from those watches? --- He said he _______ the one made in Shanghai.
---Hi. Lucy! What’s wrong with you? You look so worried. ---I have many problems to solve, but I don’t know ___________ first.
---I find the more we study, the more difficulty we have ________ out Maths problems. ---Oh, I agree with you. Maths is more and more difficult.
---What a mess(杂乱)! Tony, you should ___________ your things to keep the room clean. ---OK, Mum! I’ll do it at once.
---Where was your sister at this time yesterday evening ? ---She was writing an e-mail ______ I was watching TV at home.