Ex-1
1. are 2. is 3. is 4. is 5. are 6. am 7. are 8. is 9. are 10. are
Ex-2
1. Is Molly translating an article? No, Molly isn't translating an article.
2. Are Jack and Sam gathering pears in the garden? No, Jack and Sam aren't gathering pears in the garden.
3. Is it getting warm? No, it isn't getting warm.
4. Are we climbing a mountain? No, we aren't climbing a mountain.
5. Are you playing basketball now? No, I'm not playing basketball now.
6. Are the children washing hands in the bathroom? No, the children aren't washing hands in the bathroom.
7. Is your grandfather reading a newspaper now? No, my grandfather isn't reading a newspaper now.
8. Is your family having supper now? No, my family isn't having supper now.
9. Is Angela ironing her dress now? No, Angela isn't ironing her dress now.
10. Are you looking for your kitten now? No, I’m not looking for my kitten now.
Ex-3
1.Alice and Ron are sitting in a cafe now.
2. It isn't snowing outdoors now.
3.We're waiting for our teacher in the classroom.
4 I'm watching the children playing in the yard.
5.The girls are arguing about what present to buy for Lewis.
6 Andrew isn't having a rest at the moment.
7.Look! All the people are coming into the hall.
8 Unfortunately our experiment isn't going according to the plan.
9 Pam is standing too close to the road.
10.The students aren't having a lecture now.
11 Her health is improving day after day.
12 Look! The guide is pointing at some ancient building.
13 I'm not discussing this question now.
Северная Америка — это континент, расположенный в Северном и Западном полушариях и вместе с Южной Америкой и Центральной Америкой образуют огромный субконтинент, известный как Америка. Северная Америка омывается тремя океанами: Северным Ледовитым океаном на севере, Тихим на западе и Атлантическим океаном на востоке. Будучи третьим по величине материком на Земле после Евразии и Африки, Северная Америка занимает территорию в 9,5 миллионов квадратных километров.