At times the balance in nature is ______，resulting in a number of possibly unforeseen effects.

My mother always gets a bit ________ if we don't arrive when we say we will.

—There is no way for us to book  ________apartment. —Thus we will have to make full use of what we have now. 

Raymond’s parents wanted him to have_______ possible education.

If you follow a diet expert’s advice, eating more can mean losing _____weight rather than less.