Вставь артикль a/an там где нужно. This is computer . This is elephant. These are desks. Those are my toys. This is his computer. That is aeroplane. This is their playroom. It's very nice. It looks like cat. Look at her tea set.

Ответ:

1 This is a computer.

2 This is an elephant.

3 These are desks.

4 Those are my toys.

5 This is his computer.

6 That is an aeroplane.

7 This is their playroom.

8 It's very nice.

9 It looks like a cat.

10 Look at her tea set.

Объяснение:

№№ 3 и 4 - множественное число и неопределённый артикль не ставится.

№№ 5,7 и 10 - перед существительным стоит притяжательное местоимение и артикль не нужен.

№8 - существительного нет, а перед прилагательным артикль не нужен.