[解析]
Last week I along with my classmates was asked to attend a lecture， the theme of whom was environmental protection． It was gave by a university professor． The professor first had us to come up with the problems the earth was facing with． Then he offered some suggestions on what we could do to save your planet in an effective way． Late after the lecture， I also searched the Internet about more information on this topic． Up to now， I ∧learnt that the air pollution is universal and what we are likely to run out of some natural resources． To make things worst， climate change is becoming a great threat to human beings．
解析
1．whom﹣﹣which．本题考查关系代词．句意：上周，我和我的同学被邀请去听一个讲座，主题是环境保护，此处lecture是先行词，指物，在后面的非限制性定语从句中作介词of的宾语，故把whom改为which．
2． gave﹣given．本题考查语态．句子主语是it，指的是lecture，和give是被动关系，因此用given．
3． to 去掉．本题考查不定式． have sb． do sth让某人做某事，此处是不带to的动不定式作宾语补足语，故to去掉．
4． facing﹣faced或 去掉 with．本题考查短语搭配．be faced with是固定短语，意思是"面对…"，但如果没有with也可以用主动式．
5．your﹣our或者the．本题考查人称代词．从句中的主语是we，后面的人称物主代词应该用our，或者特指这个星球，用定冠词the．
6． Late﹣ Later．本题考查副词．句意：后来讲座结束后，我上网寻找更多关于这个话题的信息．这里需要副词later， late作为副词时意思是迟到．故 Late﹣ Later．
7． about﹣for．本题考查search …for…是固定短语，句意：在网上搜索更多的信息．
8． learnt前面加have．本题考查时态，句意：到目前为止我已经认识到空气污染是普遍的问题，我们可能会失去一些自然资源，根据 Up to now可知句用现在完成时态，句子主是I ，故在learnt前加have．
9． what﹣that．本题考查宾语从句，该句型中含有两个宾语从句，第一个宾语从句连接词that可以省略，但第二个that不可以省略，因此加上that．
10．worst﹣worse．本题考查句型搭配．to make things worse 是固定句式，意思是：事情更糟糕的是…，因此将worst改为worse．
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