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Assoonashearrived,hebeganhisresearch.→
Onhisarrival,hebeganhisresearch.
9.dueto替换becauseof
Hearrivedlatedueto(becauseof)thestorm.
10.cover替换walk/read
Aftercovering(walking)10miles,weallfelttired.
11.contributeto替换behelpful/useful
PlentyofmemoryworkisundoubtedlyhelpfultoEnglishstudy.→
PlentyofmemoryworkwillundoubtedlycontributetoEnglishstudy.
12.roundthecorner替换
IwrotedownhistelephonenumbersothatIwouldnotforgetit.→
IwrotedownhistelephonenumberlestIforgetit.
20.becaughtupin/becrazyabout/beabsorbedin/beaddictedto替换beinterestedin
Heiscaughtupin(interestedin)collectingstamps.
21.morethan替换very
I’mverygladtolearnthatyouare