Дайте краткий ответ. is it the boys bike? - yes,

Yes, it is и всегда так, с вопросительным словом и местоимением

It's theirs. держи. : )

1) what the big ears you have, grandma! 2) how dangerous the place looks! 3) how empty the islands are! 4)what an unusual clock it is! 5) how brave the boys are. 6) what interesting films! 7) how polluted the lake is! 8) how sunny  weather is! 9) what the funny clothes she wears! 10) what the tasty vegetables i've bought!

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1) now my close friend lives in moscow . 2) as a rule he spends his holidays at the seaside . 3) i’m very busy on sunday .4)  when i need help he often helps me .5)  she is always glad to see me .6) there is nothing to think about .