Множественное число существительных.
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множественное число следующих слов:
Book -……………………., boy………………….., match…………….,

city…………………….., pen…………………,apple…………………..,

sheep……………………,
desk……………………..,tomato…………………,

bus………………………,pencil…………………..,day……………………,

foot………………………, tooth……………………,fish………………….

box…………………….,pupil………………..,lamp……………………….

Archaeological zone of Chan Chan, Peru
The list of" endangered " UNESCO sites included Chan Chan-Chimu cultural center and the largest city of pre-Columbian era in the world. According to the official version, it originated around 1300. In the period of greatest prosperity, the population of Chan Chan was about 60 thousand people! The city was divided into 9 Autonomous districts, with its own temples, houses of ordinary people and palaces.
However, now you can see only the remains of religious buildings and residences. Torrential rains, floods and storms destroy the unique mud-brick city. More dangerous than an earthquake. Scientists fear that strong tremors Chan-Chan just can not stand.

She enjoyed (ENJOY) learning but she always started to feel very nervous when she had to write tests.
That Monday was not (NOT BE) a lucky day for her and she realised it as soon as she came into the classroom.
“Oh, no! I have left (LEAVE) all my pens at home.”
Jenny opened her (SHE) bag and pulled out a pen.
“If I don't find a proper pen, I will write (WRITE) in green ink.
Bella felt even worse (BAD) than she felt before.
... the tasks were printed (PRINT) on both sides of the page!
... but the second (TWO) one was a real problem.
Time ticked on but she could not (NOT CAN) concentrate on the tasks.

Then his mum came (COME) into the room and turned on the light:
“I know there’s nothing more difficult (DIFFICULT) than to get up early in the morning in December.”
Michael, are (BE) you all right?
I wish I could (CAN) stay with you today, but I can’t.
If I need anything, I will call (CALL) you at once.”
“I have made (MAKE) sandwiches already.”
“Ok. I’ll put them (THEY) in the fridge.”
It was bought (BUY) by his great-grandmother when he was a small child. She often said that even in her old age she loved (LOVE) these tales more than anything else.