31. All books ______ to the library more than three days late will be subject to a fine.
It is so nice to hear from her. __________, we last met more than thirty years ago.
The days _______ we spent together on the farm are not easy _________.
Being a _________ person, Mrs Li wouldn’t let anyone or any difficulty stop her.
________ he made up his mind to take a trip to Europe?
The number of the students in our school ________ about 3000 and ______ them study hard.