We are going to ________ a dinner party on New Year’s Eve.

The dog, if trained ____, will be made a good watch-dog one day．

___ years ago, the population of China was over20 million.

It wasn’t until nearly a month later _______ I received the manager’s reply. [ ]

The opening ceremony of the Olympic Games will be broadcast ______ this weekend. You can expect an exactly ______ night.