Many volunteers will help to ____ the city parks next Friday.A. give up B. pick up C. clean up
--This is my good friend, ____ name is David. –Nice to meet you.
–Are these his friends? --No, ______.
–_______. What’s this in English? --_______, I don’t know.
In _____room, you can see a lot of things. But some of them are not _____.
Thank you very much _____ your help.