What do you usually do ___ the weekends?
at / an
What do you first thing ____ the morning?
in
What do you always do ____ the Christmas holidays?
in
I hardly ever ..... on weekdays.
.
I never .... at the weekends.
.
What do you usually do ____ your birthday?
.
I sometimes ...... in the summer.
.
Are you an early bird or a night owl?
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How often do you exercise?
.
How often do you travel?
.
