How frequently _______, the works of Shakespeare always attract many people.
—Have you read today’s report about your performance? —I don’t care whatabout me.
In the cave they found the very book, the cover of _______was torn.
—How was your examination? —It wasn’t very difficult,but it was__________long.
---How is your plan getting along? ----I can’t carry on _____ any longer. Someone must help me.
Nuclear energy may be dangerous if