The United States is a country_ (advance) in science and technology
advanced
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InAugust1977,asatellitetogatherdataaboutthe10millionblackholeswhicharethoughttobeintheMilkyWay.
Itwillbeinterestingtoseewhat’sgoingtohappenatthenext________(elect).
Idon’tneedanyhelpatthemoment,butI_____youroffer
Studentsshould（）theirowninterestsaswellasdotheirschoolwork.
Heis______absorbedinhisownthoughtsthatheseemsunawareofwhat'sgoingonintheroom
