潜水到冒泡到露出水面，尽情呼吸这里的新鲜空气, 又潜水

mindfree

I think review is key to SC. Every question has its grammar points, some easy and some difficult. Try to learn from every SC question you did. Write-down the points that you are not familiar with and remember them, before you can apply them to new SC questions. If you use the review done by others, remember them by heart.