Jack is interested in robots, so he went to the restaurant in Liaocheng ___________ he heard that there were robots working as waiters there.
--________ has your grandpa lived here? – Since last year.
I ________ a book two days ago. I ________ it for two days.
The English test is difficult ________ interesting.
—Happy birthday! —________
—When _________he have P.E.? —He ________ it on Monday.