Thenewdiscovery_______beofgreatservicetomankind.
Agriclturalchangesinthelate18thandearly19thcenturiesinEnglandweresogreatthattheywereworthyoftheterm“________”.
重写句子：Whenwearerelievedofworkingpressuresoftheoffice,wecanenjoyhappinessandrelaxationathome.(modifyingphrase)
Thevehiclewastravelingatspeeds________90milesperhour.
Peoplewhocan’t_______betweencolorsaresaidtobecolor-blind.
