31. —You should make it a rule to do more exercise in your spare time. — I think your suggestion really deserves__________.
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
—Do I need to give a tip if I eat at a fast food restaurant in the United States? —Yes , it’s a commonto tip waiters in a restaurant.