用括号内所给单词的适当形式填空。（5分）
小题1:Children know that an elephant is much __________(big) than a dog.
小题2:You should wash your ______ (foot) before you go to bed every day.
小题3:Thank you a lot for __________ (invite) me to your birthday party.
小题4:There are many ___________ (different) between the two pictures.
小题5:Tom’s parents enjoy ________ (listen) to the country music.
