It is requested that each of the teachers invited ______ a performance at the. party.
It’s really unbelievable! Can you _______ her swimming across the English Channel?
There was _______ time _______ I hate to go to school.
---It’s getting dark, but Mr. Johnson is still at his office. ---No surprise. Who else can ______ he does?
Since David ______ downloaded a virus into his computer, he can not open the file now.
---How often do you eat out? ---______, but usually once a week.