You never know_____happiness will turn up next, so grasp every chance around you. [ ]A. whenB. where

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• The road is covered with snow. I can't understand ______ they insist on going by motorbike.[ ]A
• 繁殖优良品种的果树，为了保持这些品种的优良性状，在下列繁殖方法中，最好不用（）A．种子B．扦插C．压条D．嫁接-生物
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• 我们栽培玉米的生殖方式为有性生殖．______．-生物
• When you read the book, you'd better make a mark ____ you have any questions. [ ]A. at which B.
• -The parents try to do everything for their son.-That is________they are mistaken.[ ]A whereverB.whe
• Mary wrote an article on________ the team had failed to win the game.[ ]A. whyB. whatC. whoD. that-高
• The last time they had great fun was_________ they were leaving college.[ ]A. where B. how C. when D
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• Put the books back ____ they belong after you have finished them.[ ]A. where B. to where C. to which
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• We haven't discussed yet____ we are going to place our new furniture.[ ]A. that B. which C. wha
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• If we work with a strong will,we can overcome any difficulty, great it is. [ ]A.whatB.how C.howeverD
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• [2009年莆田市学业考试]我市的荔枝素以品种多、产量高、质量优而闻名，栽培的品系或单株有20多个，其中“陈紫”更是全国著名的优良品种，上世纪初，它还远涉重洋，传入美国南部-生物