Tom is a hard-working student．In fact, you cannot find anyone in the class ____．

To reduce emissions of greenhouse gases, many countries are increasing the use of natural gas, wind and other forms of _______ energy.

Which is ___ country, Canada or Australia?

The newly ________ president is going to carry out a series of projects in many fields.

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