The theory of evolution was introduced by Charles Darwin in the 1850s.

A) The theory of evolution

B) was

C) introduced

D) was introduced

He was forming an explanation for the phenomena he observed.

A) was forming

B) was

C) forming

D) observed

He was fascinated by the process of natural selection.

A) was

B) fascinated

C) was fascinated

D) natural selection

My car has been parked at the end of the line.

A) has been parked

B) parked

C) my car

D) car

My sister will be attending the graduation late as she is stuck in traffic.

A) the graduation

B) stuck in traffic

C) my sister

D) will be attending