The bus was empty， there was ________ on it

________ was known to them that the boss had broken his promise ________ he would give them a rise

We all like reading story books, ?

However ______ certain natural resources may be, they cannot reproduce themselves andare surely to be used up eventually.[ ]

Did Liu Ying and Liu Li come to your birthday party，Tina— I had invited them，but _______ of them showed up．