It will be difficult ________ a robot_________ the same things as a person,
Most boys _________ guns to dolls while most girls _________ have dolls than guns.
---I don’t care what my parents think. ---Well, you __________.
---My uncle goes to climb Mount Tai every year. ---Oh, really? He __________ climbing mountains.
Don’t be late again. Please try your best to be here __________.
While she was trying to pass a truck before her, she __________ another car coming.