As a teacher ， you patient .

Look at ______ boy wearing a brown hat. Is he _________ university student— Yes, he studies in Beijing University.

It is really terrible ________ me to wait for a long time ________ a rainy night.

As is known to us all, under nocircumstances______ temporary economic development at the expense of theenvironment and resources.

I ______ take an English exam next Tuesday.—______ you have taken everything you need.