Is this your book, Alice? —Yes, it is ____ book. Thank you.

_______ does your sister go to school?— At 7 o’clock.

I don’t know if it _______ next Sunday. If it _______, we will go and fly kites.

We usually use “an” before a word beginning_____ a vowel (元音音素).[ ]

Only after her mother came to help her for the first few months _____ to begin her project.