His_______（allow)to see……made me happy.应写什么?为什么?

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• His_______（allow)to see……made me happy.应写什么?为什么?
• 课文I live in a very old town which is surrounded by beautiful woods.surround为什么要用过去式?现在这个小镇不也是被树林环绕吗?课文On Sundays,hundreds of people come from the city to see our town and to walk through the woods.用every sundays可以吗?课文but people still throw their rubbish everywhere.为什么不用litter?课文What I saw made me very sad.saw made两个动词连用中间为什么不加to?课文Among the rubbish,I found a sign which said,我写的i found a sign which said in the rubbish可以吗?主要是among 和 in!
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