Use the correct article (a or an): academy, album, bright album, actor, great actress, arch, marble arch, chance, unlucky chance, dove, ear, elf, tiny elf, horse, hour, long hour, institute, lemon, mill, obelisk, opera, italian opera, owl, paper, rabbit, quarter, train, wing, voyage, year.

ответ:

an academy, an album, a bright album, an actor, a great actress, an arch, a marble arch,   a chance, an unlucky chance, a dove, an ear, an elf, a tiny elf, a horse, an hour, a long   hour, an institute, a lemon, a mill, an obelisk, an opera, an italian opera, an owl, a paper, a rabbit, a quarter, a train, a wing, a voyage, a year.

если слово начинается с согласной, то просто артикль а. если с гласной, то an.

an hour - исключение

My favourite book is "the adventures of sherlock holmes".  the book was  written by arthur conan doyle,  the famous writer from scotland in 1891. the book about the famous detective is popular all over the world.  sherlock holmes and his friend doctor watson investigate different crimes in london of the 19th century.  sherlock holmes uses his famous method of deduction to solve these crimes.  he looks for stolen jewels, finds missing people and points to the murderers.  the stories are exceptionally interesting and exciting.  many of them were made into  films.

She teaches english in our school she doesn't teach english in our school does she teach english in our school she is teaching us to swim now is she teaching us to swim? she isn't teaching us to swim she will teach him to speak spanish next year will she teach him spanish? she won't teach him spanish he has breakfast at 8 o'clock every morning does he have breakfast at 8? he doesn't have breakfast at 8 he is having breakfast now is he having breakfast? he isn't having breakfast he will have breakfast at 9 o'clock tomorrow will he have breakfast? he won't have breakfast they do homework every day do they do homework? they don't do homework they are doing homework now are they doing homework? they aren't doing homework they will do homework in the evening will they do homework in the evening? they won't do homework in the evening