1、Vice-presidents' wives would fill in for first ladies.
2、We' ll have to find someone to fill in for Francis tonight as he' s ill.
3、I take the liberty to write you in the hope that you might need someone to fill in for you.
4、You have to fill in form A20.
5、They can perform essential tasks, lend you money, encourage you, work for you, help you deal with an emergency, serve as a sounding board for your ideas, even fill in for you for a couple of hours.
6、They are also treating recently retired staff as a just-in-time workforce that can be used to cope with surges in demand or to fill in for absent colleagues.
