One strategy you can use to determine the meanings of unknown words and phrases is to look at the context clues. Context clues might be something like a picture, words or phrases you already know, using what you know about the text already.
Hope this helps!
1. <span>present
2. </span><span>the past tense
3. </span><span>past participle
4. </span><span>present participle.
Hope I helped:P</span>
The second one is the best answer
I most contexts, no. It can be considered an error if viewed from a programmer's perspective, because a bug is viewed as an error in the code of a program. If it is not viewed from a similar perspective, then it is not a synonym. Thesaurus.com can be a helpful place for you.