Some people fear that ________ air pollution may bring about changes in _______ weather around the world.
25. ----Do you enjoy your stay in here?----Yes. A beautiful autumn day ___________ the wet summer we have had.
31. George ___ the good chance to present his proposal to the director, and at last, it was adopted.
23. The government have realized the use the returnees make ______ the experience and skills ________while living abroad.
22. Food aid______ is the key to______ the problem _______ now.
II. Grammar and Vocabulary (15 points)21. Hunger is _____ number one global health risk, so ______WFP has organized a lot of programmes, which targets people most at ________risk.