---- I’m feeling so tired now.---- _________ stop and have a rest?
--- 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.