1. Camels
2. Horses
3. Desert
4. True
5. 300
Well, I can't completely help, but I do know some tricks.
For example, write it out fully in English, or the best language you have fluently, then put the whole essay into a translator. Next, make a new document, and copy and paste the translated version into it. Read it out many times, get some quick help (I know some podcasts that can help you learn Spanish easier, like Duolingo) and, once you have learned a bit more (another trick is to read through it using the translator, and see some of the translation parts to learn more Spanish from words that you used) filter out any kinks, and turn it in! It seems harder written out than it is, but it's an efficient way!
A cambio is to exchange in spanish
The answer is A. Tú tocas el piano. Because Tu tocas is the only correct way of saying you are playing the piano in this instance. C is saying "tocan" which is wrong because it's saying you but then using a the group form of playing. The same thing with B, it's also using the group form of playing and it's past tense. And D is using the I form of playing not the you form.