Someone is knocking at the door.It ____ be Tom .—–No, it ______ be him ;he has gone to Sydney.

CaoWenxuan won the Hans Christian Anderson Award ( 国际安徒生奖) ________ the afternoon of April, 4th.

About_______ of the books in our schoollibrary________ written in English.

Sustainable living is ____ lifestyle that attempts to reduce _____ society’s use of the natural resources.

uncertain ___ side effects theseweight-loss drugs will bring about, although hundreds of thousands of patientshave taken it.