她总是蹭别人的网却从不帮忙付账单，真是个爱占便宜的人。

She always uses our WiFi but never helps pay the bills—what a ___freeloader.

他总是蹭别人的饭却从不请客，真是个爱占便宜的人。

He always eats others' food but never treats them back—what a ___freeloader.