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