Language learning vocabulary

I've been having trouble getting __ _____ ____ learning new vocabulary.

(to make an effort to understand and deal with a problem or situation)

(a)  

I have to _____ __ __ my presentation skills. I have a meeting with some investors next week.

(to improve your knowledge of something already learned but partly forgotten)

(a)  

I really ________ ____ listening and reading at this level, I find them really complicated.

(to experience difficulty and make a very great effort in order to do something)

(a)  

My son has an ___ ___ music. He can play any song just by listening to it once or twice.

(being good at hearing, repeating, and understanding sounds)

(a)  

Small children usually (a)   language, they don't go to school to learn how to speak.

(to get or obtain something)

After years of study I can now (a)   a conversation with a native speaker in English.

(to have something or to control something)

At this point, I am already __________ __ taking online English lessons.

(being familiar with something)

(a)  

I know studying and working can be exhausting, but I need to ____ __ __ if I want to achieve my goals this year.

(to continue to do or work on something)

(a)  

I've been working really hard to (a)   a better position at my job.

(to reach or succeed in getting something)

I immediately ___ ____ practice the new vocabulary I learned and I can already remember a lot of it.

(to spend a lot of time or effort doing something)

(a)