用所给词的适当形式填空。 1. _____ (look) at the blackboard. 2. Let's _____ (talk) about the picture. 3. _____ (be) there a nice picture on the wall? 4. Does your brother _____ (join) the volleyball club? 5. We have two basketball _____ (club) in our school.
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【简答题】(理).已知a n = 1 4 n + 2 100 (n=1,2,…),则S 99 =a 1 +a 2 +…+a 99 =______.