А. Present Indefinite

А. The students can not perform the operation.

Б. This student is my friend

В. Who was born in 1881?

Г. He did research work

Д. We listened to his speech.
521. Choose the sentence with Modal Verb:

А. Are you ready?

Б. Who is your friend?

В. Can you help me?

Г. Who become interested in bacterial action?

Д. She is not a doctor.
522.Answer the question: What is the length of stomach?

А. 21-25 cm

Б. 8-10 cm

В. 2 m

Г. 1 m

Д. 5 m
523.Find the answer: What are in the oral cavity?

А. Soft and hard palates, stomach, esophagus

Б. Teeth, intestine, liver

В. Salivary glands, tongue, spleen

Г. Teeth, tongue, salivary glands

Д. Leg, hand, heart,

524. Choose the range of the parts of the Alimentary Tract:

А. mouth, pharynx., esophagus, stomach

Б. stomach, intestine, skull

В. blood, vessel, liver

Г. spleen, oral cavity, ear

Д. Kidney, spleen, stomach.
525. Find the answer: What is the Alimentary Tract?

А. the main organs of respiratory system,

Б. are separated from each by the mediastinum,