Over fifty countries _______ the AIIB(亚投行) so far.
All the tourists _______ about the bad service in that restaurant.
We are going to ________ a dinner party on New Year’s Eve.
In Germany, you shouldn’t arrive late to a dinner party; you should always be ___.
Attention, please. The plane to London _______ off at 9: 00.
The Spring Festival falls ________ the first day of the Chinese Lunar year.