1. Our school gets ... (hundred, hundreds) of letters every year.
2. Five ... (hundred, hundreds) new houses were built in our city last year.
3. You can see (million, millions) of stars in the night sky.
4. Six ... (million, millions) tourists visited Rome last summer.
5. Our library has received four ... (thousand, thousands) new books.
6. ... (thousand, thousands) of pupils nowadays try to learn two foreign languages.

Last year we went to Antalya to visit OUR grandparents. THEY were very glad to see US. IT was a very good holiday for US. 
We went swimming with MY brother. HE swims well. WE had 
picnics all together. The picnics were very funny. My grandmother made 
sandwiches for US. SHE makes really delicious sandwiches. I love HER all meals. 
OUR father and mother went to discos at night. THEY like dancing
and at the weekend THEY go to a dance club. While OUR parents were out, OUR grandfather told US funny stories. WE laughed all night. OUR
grandmother made pop-corn for US. 
In the mornings WE had breakfast in the garden. IT was full of flowers. There were ducks and hens in the garden. WE played with the ducks and the hen. THEY were very lovely.
IT was a very beautiful holiday. I am waiting for next visit to OUR GRANDparents impatiently. 

1. dealing - Participle I, heated - Participle II
Работая с постоянным током, сопротивление проводника или сети R принято находить путем снятия с нагретой нити в вакууме - с поверхности щелочного металла на фотоэлементе - с мопощью закона Ома.
2. recorded, emitted - Participle II
Величина регистрируемого анодного тока зависит от электронов, излучаемых нитью.
3. giving - Participle I, bombarded - Participle II
Излучение - это процесс с участием электронов, которые излучаются с пластины и сетки вакуумных трубок, которые бомбардируются, тем самым создавая вторичный поток излучения, также часто повторяющийся.
4. decreasing - Participle I