I don’t remember having ever seen John since last weekHas he gone somewhere? — Not reallyHe ______ his newly-bought apartment

The books are so nice，which one can I take —Oh，you can take ________ of them．I’ll keep none．

Hubei province has also been stricken by the heavy fog and haze, which ________ be worse and worse and will be a threat to human’s health.

There are _____ in the room.

When _____, the new stadium will hold 50, 000 people [ ]