Answer:
1. Our answers are correct, but their answers are incorrect.
2. Your clothes are new and your shoes are new.
Explanation:
In number 1, we have two independent clauses with contrasting ideas. The first one affirms the subject's answers are correct. The second one affirms the other subject's answers are incorrect. For that reason, it is best to use the conjunction "but", which conveys a contrasting idea:
Our answers are correct, but their answers are incorrect.
In number two, the two clauses are expressing similar ideas instead of contrasting ones. The second idea basically adds to the first one: someone has new things - clothes and shoes. The best conjunction in this case is "and", which conveys an idea of addition:
Your clothes are new and your shoes are new.
The correct answer would be a present
The answer would be D, since a quartet means 4, and a triumvirate means 3. So again the answer is 4:3.
It's in passive voice.
A good rule of thumb for cases like this is that if it has any variation of the verb "to be" (is, was, were, etc.) it's passive voice.
If you wanted to switch it to active voice you need to get rid of "is", and this is usually done by switching the subject and the object (so while in the original sentence, the race car is the doing the verb, to switch it you'd need to make the sixteen-year-old boy be the one doing the verb). This new sentence would be something like:
The sixteen-year-old boy drove the racecar
