Is the phrase sounds natural? Have a particular fondness of......

Is there any mistakes in the sentence? "Undoubtedly, only after we have already got a general grasp of the knowledge can we express our own ideas freely and communicate them with others ."

Comparation&comparison Both comparacion and comparison mean contrast, right？ What is the difference between them?

Could you point out my mistakes in the two paragraphs? For students, vacation is a vital chance to improve personal abilities. However, opinions differ on how to take advantage of the valuable time. Some people contend that students should take a course on the subject that has no direct connection to their majors which can broaden horizons. It may seem reasonable at first glance. However, if taking a closer look, volunteer works should be given more emphasis. In conclusion, allowing to the fact that doing volunteer work can cultivate communication skills and make a better resume which aids us in future career, it is better for students to do volunteer works rather than taking another subject with no relationship to majors in vacations.

Is this sentence right? Had his teammates not passed him the basketball, he could hardly have won the game.

prone&tend to&apt&inclined I am prone to sleeping when spring comes I tend to sleep when spring comes I am apt/inclined to sleep when spring comes Are these sentences right?

I really blew the question about it on the mid-term exam What's the meaning of "blow" in the sentence "I really blew the question about it on the mid-term exam"

italki premium membership Hello~ I am confused about the italki premium membership.. I cannot find related information. Can you tell me what italki premium stands for? What's the differences between premium user and ordinary user? And how to get It? Thanks a lot~

“indispensable" and "indispensible" Are both "indispensable" and "indispensible" OK? Are they the same?