选出下列各组单词中画线部分读音与其他三个不同的一项。
(    )⑴A. bag B. map C. grade D. can
(    )⑵A. usually B. just C. under D. up
(    )⑶A. sweater B. team C. bread D. head
(    )⑷A. pear B. there C. where D. here
(    )⑸A. collect B. cock C. o’clock D. Holiday