They understood that mistake a)made b)make c)had made d)are making

Made потому что они уже поняли pr. perfect

С
т.к время, а глагол make должен быть употреблен в еще более времени (по смыслу предложения) - had made

1) The internal organ responsible for breathing (answer: light)2) Oxygen from the lungs enters the rest of the organs and the body through .. (answer: blood)3) The circulatory cell carrying oxygen is ... (answer: hemoglobin)4) Which (what) external organ (s) does the person perform respiratory functions? (Answer: mouth or nose) take anyone only in the matter of this hint5) In which part of the body (trunk) are the lungs (answer: diaphragm)6) Breathing is what process (answer: physiological)7) Which organisms are respiratory? (Answer: alive)8) What is absorbed by the body in the process of breathing? (Answer: oxygen)9) What does the body stand out in the process of breathing? (Answer: carbon dioxide)10) Inhalation and exhalation is carried out by changing the size of the chest with ... (Response: respiratory muscles)11) Where does air enter through the nasal cavity? (Answer: pharynx)12) Where does air get through the larynx? (Answer: trachea)13) What is the name of the thinnest bronchial branches? (Answer: bronchioles)14) Pulmonary vesicles in the bronchi are called ... (answer: alveoli)

At 6:30 we wake up and brush our teeth. Then at 7:00 we wear our clothes and have breakfast. At 7:30 we go to the bus station to go to school. At 8:00 we are in the school meeting friends. At 8:30 our lessons start and it's the most boring part of the day because we need to study stuff and there isn't much fun. "The first lesson we have ... . It's my favorite/not my favorite subject. After we have little break were we can have fun, play around or go to the cafeteria to eat something." (These part you can write many times so just put other subjects and other details like: interesting/boring; favorite/no; and so on) So after the school we catch the bus and go home. At home we quickly do our homework and go play with our friends. After that we have dinner and then we watch a movie with our family. At 10:00 we go to bed but to honest we don't sleep till 3:00 minimum because we play video games/serf internet/watch YouTube.
Sorry for my English it's my 2nd language... time subjects and details you can change. Enjoy