---- What are they doing?---- Look, they ________ on the playground.A. are running B. runs C. is running
They went on working ________the heavy rain.
--- Have you seen the film Titanic? ---No , but I ________.
---- Is Ann knocking at the door? --- No, it ______ be Ann. She has gone to Beijing.
I tried several jackets on ,but _____of them fit me well.
We should never ________till tomorrow what we can do today .