1.Who ( was discovering/has discovered/discovers/discovered ) America about 600 years ago ?
2.We can't go out now because it ( rain ) heavily outside.
3.You can borrow ( as many/as much/so much/too many ) books as you want.
4.We can see many international programs ... different channels ( on/in/by/at )
5.My mother ( buy ) me a pair of sports shoes for my last birthday.
1. discovered
2. is raining
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