No reader ________ take away a book from the library without the permission of the librarian.

_______ he had not hurt his leg, John would have won the race.

 One of the requirements for the fire is that the material ________ to its burning temperature. 

 —What do you think we can do for our aged parents?—You __________ do anything except to be with them and be yourself

---Are you still going to Shanghai for the Spring Festival? ---Yes, but I really     because I have a lot of things to deal with.