Ifyouhavedifficultylocatingaparticularbook,pleaseaskourlibrariansfor___(assist).
Thisessayisstilltoolong.I’llhaveto___(short)itbyoneortwopages.
TheUnitedStatesisacountry_(advance)inscienceandtechnology
Studentsshould()theirowninterestsaswellasdotheirschoolwork.
自由竞争资本主义时期,资本主义国家对外经济关系的主要内容是()