——Jack _______ takes part in social activities.——Yes, he isn’t like his brother, who is always active.
---How often ___________ the Olympics _____________? ---Every four years.
There were two small rooms in the house, ____ smaller of which served as ____ kitchen.
Is there _______________ to sleep for half a day?
I think you can help ____________ a donation or doing some voluntary work.
Don’t worry. There’s still ________ time _________.