All animals _______ men feed on plants or other animals.
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 .