I tried hard to get some information about the new technology out of his mouth,but he remained __________.

The students are _______ to ride the public bicycles to Mount Tianlong for a spring outing.

When dealing with students, teachers are supposed to adopt ______ and caring approaches, as they are unique young individuals of different personalities. 

--- I was walking along the street and all of a sudden, a car cut in and knocked me down．--- You can never be ______ in the street．

The pilot asked all the passengers on board to remain ______ as the plane was making a landing.