This is how I would write it, but please do not take my information as 100% correct. I hope I helped! "About a year ago, I helped my roommate choose his postgraduate major. He made his decision after I suggested several majors that I thought suited him."

Here in the United States a Firefly or Lightning bug is an animal that glows yellow. Although there is one T.V show called Firefly.

Who would you be asking? That may help me understand that you are trying to ask.

I would say number 2 sounds more natural because it is in past tense. I would say either works, but number 2 is my preference. Sorry for any inaccurate information, hopefully I helped!

This expression basically means to be in disbelief about an event occurring. "There is no way he did that, but if he did I'll eat my hat." Hopefully I helped, this expression isn't as common in the United States.

This is just associated to a sound. For example, in English there are things called "Onomatopoeia". A few examples of these sounds would be "Beep" "Ahh" "Haha" "Ho ho ho" (This is what Santa says" or even "hissssssss" for the sound of a cat being angry.

The part you do not understand means if someone makes a mistake then they need to tirelessly correct that mistake. 1. "Their" stands for the person making the error. "They" stands for the errors that may occur. 2. "Should they" basically means "if they", so it would be "if they occur". Sorry if I provided any inaccurate information!

I will do my best to answer the question, sorry for any inaccurate information. The first sentence I would not say is outdated but should be written as "The best way to form a bond with a pet is to play with it." "The event will offer you a good opportunity to network with industry leaders from all over the world." Replace network with "connect" and you have a modern phrase. "Throughout her career, she has battled gender discrimination." This does sound natural but you could replace "battled" with "fought against" "We're going to videotape the whole event." This does not sound natural and many people from the United States would just say "record" in place of "videotape". "They winter in their mansion in Florida every year." Replace "winter in" with "go on winter vacation to" "Parenting a teenager is not an easy thing." No change "She looked as if she had aged overnight." No change "We vacation in Hawaii every year." No change "Yesterday, I lunched with Mark at the Oasis Cafe." replace "lunched" with "had lunch" "Jacob's twelve sons fathered the twelve tribes of Israel" No change