The plan __________just because people were unwilling to cooperate (合作).

 When I was tired of my work, I would        my belongings and go on a short trip.

Every country ______ to accept its own way of life as being the normal one and to praise or criticize others, as they are similar to or different from it.

Passengers are permitted ______ only one piece of hand luggage onto the plane.

With so much noise of the traffic, I couldn`t __________and do my research work.