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1.Helen started to grow these treesforour school two months ago

= Helen has ............................................................................

2.It isn't necessary for students to wear uniforms everyday in a week

= Students do........................................................................

3.We should use energy-saving light bulbs to protect the environment

= Energy-saving.......................................................................

4.Linda said to the Browns ,''Are you having a barbecue outside this villa tonight ''

= Linda asked...............................................................................