去掉偏旁，组成新字，再组词。
征____ ____ 研____ ____ 坛____ ____
____ he is very tired, he doesn't have a rest.
如果a与b互为倒数，c与d互为相反数，那么 ab3−c+d−1 的值是 ____．
读图，回答问题．
