What do you think is the best way learningEnglish

How are you getting along with your project?— I was about to give up when an idea occurred to me ________ I could work with my roommate Tim. [ ]

He was busy chatting online that he didn’t anything dangerous on the road while walking. As a result, he was knocked down by a car.

My bicycle is nowhere to be found. Who ___ have been using it?

Here _____ some photos ____ my family.