Help please. I will mark you as brainliest !! How is taking an online course different from taking a course in which a teacher delivers
lessons and assignments? What are the challenges of learning online? What are the
possible advantages? What strategies do you need to help you succeed in a English class ?

Remember that short and steady practice is much better for the mind than long and irregular periods, so you don’t need to spend all day practising: just a few minutes every day will be enough for you to practice in any way you choose: reading, listening to music or doing exercises. Try to make it an everyday habit.

Explanation:

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).