Jack did nothing but ___.
Please don't ______ him. He is quite ______ about his girlfriend's words right now.
The drug did not ______ his health. In fact,it seemed to have no ______ at all.
Many young graduates devoted dozens of years to ______ success in life.
For years scientists have been worried about the ______ of air pollution on the earth's natural conditions.
Don’t be angry with us. We ____ with you together, but we were busy with our final reports when you called in.