___ difficult and challenging thetask may be, we must finish it on time, because there is a possibility _________we’llbe fired if we can’t fulfill the task on time．

Who is _______ English teacher —Well, it’s Mrs. Green. She teaches _____ English very well.

A number of boys singing songs. The number of boys getting larger and larger.

______ come into leaf or bloom is obviously a sign of spring.

I couldn’t do my homework with all that noise ___________ outside.