English question, please help.?

Do most people aspire the "K" sound when they say the following?

I thinK he is handsome.
I thinK she is beautiful
I don't liKe you.
It's liKe, ........

and also the following:
neXt
eXcuse me
perfeCt
doCtor
bacon deluX

Do you keep the "K" sound silent like "g", or do you aspire it clearly all the time?
Thank you.