The joke told by Tom made us _____, so the teacher couldn’t make himself _____.
(2012年重庆联合诊断性考试)It is rather difficult to make friends with him,but his friendship,________,is more true than any other's.
(2012年石家庄质量检测)Once ________,such a chance might never come again.
(2012年江苏南通九校联考)When ________different cultures,we often pay attention only to the differences without noticing many similarities.
(2012年潍坊市高三质量检测)A harmonious society is like a symphony or orchestra-each person contributes a small sound,but when________with other sounds,it becomes beautiful music.
(2012年河南长葛高三月考,29)He made another wonderful discovery,________of great importance to science.