1. The mother bird looked at her baby with a ________ look.

A. concerned        B. concern          C. concerning       D. unconcerned

2. With the problem _________, they were happy and relaxed.

A. settling         B. unsettled        C. settled          D. to settle 

3. My uncle agreed, _________ that my father had got to go with me.

A. adds         B. adding           C. to add           D. added

4. With time _________, I gradually realize the importance of health.

A. goes by          B. to go by             C. going by             D. went by