What do you think of our design for the new car? —Pretty good. But I find theirs is _____ worth considering and study.

Now that you have accepted the task, the only thing you can do now is ______ on how to fulfill it.

Bob likes the camera very much because it can be _______ to take pictures in cloudy or sunny conditions.[ ]

Liu Xiang is well known all overthe world, he ____ to appear in films.

Professor White has received a letter ___ to give a lecture in Peking University.