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Books are a great way to learn new English words. I recommend you search on the internet to find ebooks for your English level.

color and colour are the same.

While this is a common philosophical question, there is actually a firm answer that makes use of the theory of evolution. The answer is an egg that was laid by the immediate evolutionary ancestor to the chicken. The genetic differences between that parent and the chicken would only have been very slight. This raises a new, more philosophical question - how many genetic differences are required to define a new species?

Check wikipedia ... ;-) "Irregular verbs in Modern English typically derive from verbs that followed more regular patterns at a previous stage in the history of the language..."

Find an Arabic tutor to learn the language faster.

Bodybuilding is a gerund. In it's functure as a noun it is third-person-singular. So just like with he, she, it, it is followed by an "is"... (A gerund is a verbal - a word that is formed from a verb and retains certain characteristics of a verb (e.g., tenses, the ability to take an object) but no longer functions as a verb in a clause. A gerund is a verbal that always functions as a noun)

Justin Bieber got found on YouTube. If you want to be a singer, you can upload singing videos on YouTube. Maybe, you can sign up for concerts.

Both countries are beautiful. I have always wanted to visit Australia.

Chocolate or Chocolates? Okay, let's look at the words. Chocolate is uncountable, chocolates are countable countable, if you have a box of assorted chocolates you can count them, but as a solid material you can't. So 'I'd like some chocolate' (maybe a bar of chocolate) then it isn't countable. If you say I'd like some chocolates, then as sweets (candies AmE) then you can count them - the simple answer is chocolate and chocolates can both. countable and uncountable.

The word is a plural subject pronoun. The correct sentence will always be "they are".