We usually use “an” before a word beginning_____ a vowel (元音音素).[ ]
Uncle Li has a flat _____ two bedrooms and two bathrooms.[ ]
The first thing _____ I should do is to work out a study plan for the next term.
It can’t be a（n） _______ that four jewelry stores were robbed in one night．
Can I help you? —Yes. I want two ______ eggs.