You can choose _____book you like in the library.

I’m moving to the countryside because the air there is much fresher than ________ in the city.

Neither side is prepared to talk to ____ unless we can smooth thing over between them.

There are a small number of people involved, possibly ______twenty.

 — Would you like to go to the cinema with me this evening？— I’d like to, but I won’t be free tonight. Let’s make ____ some other day.