Why do we have to ______Sue’s selfish behavior？We should teach her to care for others.

(2013·乌鲁木齐高三第一次诊断性测验)That scientist ________ work is successful has been made a model worker.

periment has_________ thepossibility of the existence of any life on that planet, but it does not meanthere is no life on other planets

Jack with his friends,_______ going to_______ their English teacher tomorrow.

nderful to go away for a month, _____all worries and responsibilities!