If the manager is free and _____ us, please tell him that we _______

People in many parts of the world are ______ for water, and more people will need morewater in the next century.[ ]

sses, you’d better understand as muchas possible while ______ notes.

Danny will invite my friends and ________ to his birthday party next Sunday.

he development of science, more new technologyto the field of IT.