Woodisoften_________paper.
Atthismomentthebellrang,________theendofclass.
Onewaytounderstandthousandsofnewwordsistogain__________goodknowledgeofbasicwordformation.
AnA4sizedpanel(太阳能板)putontothebackofajacketcosts__________US$15.Itcould__________acellphoneduringasummerwalk.