Water is composed _______ hydrogen and oxygen.
A、ofA
becomposedof：由…组成。句意：水是由氢与氧化合而成的。
Hewas______towithdrawfromrunningforthepresidency.
Ittookmeamonthtogetrid_______thecough.
Studentsshould_____theirowninterestsaswellasdotheirschoolwork.
Thesadconditionofwomenworkingashouseservantsaroundtheworldreceivedmuchmedia_____earlythisyear.
Theboycomplained_______apaininhisstomach.
