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Hello dear members of the Forum... Emotion: smile

Would you kindly tell me the appropriate verb forms to fill the gaps (in the following sentence) with? 

- I ______ (a. save up, b. am saving up) because I _______ (a. am going, b. go) abroad in July. 

I chose 'b' - 'am saving up' (for the first blank) and 'a' - 'am going' (for the second), and the site on which that is given marked me 'correct'. But I'd like to ask you whether or not I can use 'a' - 'save up' and 'b' - 'go' for the gaps, please. I'm asking this to you because 'present simple' is also used for things that happen in the future.

Thank you all. 
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Choose continuous for both.

'I save up' would suggest a habit, which does not fit with the short-term nature of the activity.
Comments  
Answers are B and B, both present continuous. The second is present continuous for future.