The pictures ______ on social media yesterday., are posted, was posting, were posted, The office ______ every evening., is cleaned, was cleaned, cleans, People ______ throw trash into rivers., don't have, mustn't, weren't, We ______ recycle plastic bottles to reduce pollution., were, was, must, The website ______ by the IT team every month., is updated, updating, was update, Many volunteers ______ money for the community last year., raise, raised, were raising, I ______ helping at the shelter when the visitors arrived., were, am, was, The package ______ to my house last week., was delivered, delivered, is delivered, Students ______ use both sides of the paper to save resources., were, have to, was, We ______ collecting trash when it started to rain., are, were, was, Someone posted the pictures online., , , , The company cleans the office every night., The office was cleaned every night., The office cleaned every night., The office is cleaned every night., Someone repaired my phone yesterday., , , , Volunteers collect trash every Saturday., Trash is collected every Saturday., Trash collected every Saturday., Trash was collected every Saturday., The teacher completed the report last week., , , , It is necessary to recycle paper., We must recycle paper., We were recycling paper., We don't have to recycle paper., It is not necessary to print every email., , , , It is prohibited to litter in parks., People don't have to litter in parks., People were littering in parks., People mustn't litter in parks., It is required to save water., , , , It is not necessary to drive if you live nearby., You don't have to drive., You must drive., You were driving., I was posting a comment online when ______., , , , We were cleaning the beach when ______., a sea turtle appeared, a sea turtle appearing, a sea turtle appears, She was volunteering at the shelter when ______., , , , They were raising money when ______., a company offers support, a company offering support, a company offered support, I was discussing environmental problems when ______., , , .

Unit 7-9

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