Themorewelookedatthepicture,________.
Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
________somanypeopleintheUnitedStatesbeenoutofworkastoday.
Thisdiploma(毕业文凭)________thatyouhavecompletedhighschool.
Theproblem________whenthestudentsrefusedtodotheirhomework.
It________asashocktorealizethatIwasnotaloneintheroom.