Varieties of after-class activities _______ to enrich students’ school life are held on Friday afternoon every other week in our school.
The chairman thought _______ necessary to invite Professor Smith to speak at the meeting .
------Flight 302 to London_______ until 7:30 tomorrow morning. -----No wonder I hear so many complaints from the passengers.
When the American constitution ______into effect in 1789,it didn’t contain any words guaranteeing the basic rights of ordinary citizens.