根据句意,用单词的适当形式填空:(5☆)
(1)He is ________(young) and stronger than me .
(2)I ________(buy ) presents on my holiday .
(3)What _______ (do) you do last weekend ?
(4)She ______ (see) the elephants last Monday.
(5)Sarah ______(feel) sad, because she failed her math test.