New medicines and instruments ______ every day to extend life.
----It’s cloudy outside, Please take an umbrella. ----- ___________.
Don't get off the bus ________ it is stopping.
—John always thinks of others instead of himself. —So he does. It is________ him to offer help to others.
Considering the advantages of the method, they decided to ________ it.
Teaching as a career ________ to many people because of the long holidays.