从方框中选用合适的词，并用其适当形式填空。

please

thin

hear

excite

they

小题1:An elephant has poor eyesight but good _________ and smell.
小题2:I went to HK for my holiday, and it was really a __________ trip.
小题3:Mother giant pandas often leave baby pandas for two whole days by _________.
小题4:Swimming is not as __________ as cycling.
小题5:He is as tall as his brother, but his brother is much _________ than he.