－We could have asked Mr. Zhang forhelp. He is always ready to help others.－I ________ that. A long time_______.

he world’s population ______ water shortageswithin 15 years according to the World Bank, just one of many recent alarmingreports on the world’s fresh water supply.

When the headteacher announced his plan for a spring outing，the ______ of the students in the class ______ for it.

Ann is in hospital—Oh, really? I ________ knowI ________ go and visit her

Could you please _______ out the rubbish