Ответ:

1 There are some
flowers in the vase. They are beautiful. 
2 Some articles are very short. 
3 John can`t find any door. 
4 Are there any bad pupils in his group? 
5 Give him some hot milk and honey. 
6 George haven`t seen any people in the mountains. 
7 Some houses of our village are made of bricks. 
8 Has Jane bought any German books that day? (хотя м.б. и такой вариант: Has Jane bought  some German books that day? Это разное смысловое значение. В 1-м случае – купила Джейн какие-нибудь немецкие книги тогда? Во 2-м: купила Джейн несколько
немецких книг тогда?)
9 James doesn`t see any way out now. 
10 There are some apples and oranges on the plate. Help yourselves.