You can certainly leave the classroom as soon as your homework__________.
. We are now living in an age _______ many things are done on computer.
The mayor of Shanghai says that all construction work for the World Expo ______ by now.
.Most of them have no doubt _______ he will pass the driving license.
. It is believed that this book is ______worth reading than that one.
Two middle-aged passengers fell into the sea. _______, neither of them could swim.