Answer:
1. The
2. an; an
Explanation:
1. <u>The</u> boy slipped on the floor.
The should be used as the relevant article when the noun in the sentence is specific and the only one being referred to as is the case with the boy in this sentence.
2. There is<u> an</u> apple and <u>an</u> orange in the basket.
As both apple and orange begin with vowels or rather have a vowel like sound, the relevant article will be ''an'' because this is the article to be used when referring to vowels.
Look at this flea, and you'll understand that what you're denying me is very trivial. The flea sucked my blood first and then it sucked your blood. Now our bloods are mingled in the flea's blood. This mixing of bloods is not a sin or anything to be ashamed of. The flea now grows big with a new life inside it. The little bloodsucking flea has achieved much more than what we as lovers have attained.
I believe the answer is C. Even though they can all be good.