36. B nonessential
37. A essential
38. A essential
39. B nonessential
When essential, don't put commas. When nonessential, put commas.
If you are unsure whether or not it is essential, take it out and see if it still makes sense and nothing is unclear. If it doesn't make sense, then it is essential and commas are needed.
Were
Left
Arrived
There were two flights to Arbaminch this afternoon. The Ethiopian airlines flight left at 1:00 pm and arrived at 2:00 pm.
Answer:
I'm pretty sure it's tradition, otherwise it's gathering.
Explanation: