Digestion of _____ begins in the mouth by the enzyme ________.

Directions: Fill in the simple past tense and past participle of each verb. Present Simple Past Past Participle write do give think hear

Presence of _________ in the blood stream would stimulate increased gastric secretion.

The extra volume of air that can be inspired after a tidal inspiration.

Directions: Match each sentence with the correct explanation. The action: started in the past and continues into the present repeats during a period of time from past to present occurred at an indefinite time in the past   I have always liked ice cream. Jason has taken amazing pictures. He has received many awards. He has been a photographer for the last twenty years. He has helped us see the world.

Directions: Rewrite the sentences using the present perfect. Ivan lived in the U.S. for ten years. There was a lot of snow in Boston this month. 

Directions: Choose the correct answer from the drop-down menu to complete the sentence.  The weather has been very rainy two weeks. This is the rainiest April we’ve had 1999.

Directions: Fill in the simple past tense and past participle of each verb. Present Simple Past Past Participle run fly tear speak drink

After bicarbonate ions are produced in the erythrocyte, it moves into the plasma and is exchanged with  a _____ to keep electrical neutrality.

A new autoimmune drug has been developed that has a side effect of inhibiting the adaptive immune system.  Which of the following would the drug most likely affect?