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

After I graduate, I’ll try to get a job, you know, as engineer. —You’re practical. I’m sure you can do a good job.

We have socks_____ all colors_____ just ￥2 each.[ ]

The woman asked the policeman .

How was your summer holiday, Lily?—I went to Beijing with my parents and we _________ a good time there.