Posted by John on Sunday, May 13, 2012 at 7:16pm.
In American English..
I have no minutes left on my phone, I need to refill.
They are experimenting (or trying out) a new vaccine to (prevent) (cure) cancer. I am not certain of your purpose intended for the vaccine.
1. This is fine. I think "top it up" is a British phrasing that's not used in the US, but it's correct.
3. ... a new vaccine to prevent cancer.
Nice!
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