Read these sentences and fill in the gaps with 'could', 'can', 'couldn't', 'can't'.

1. Adam and his mother open the door because it was locked.

you mustn't open the door for a stranger. a stranger should trick you. you might answer the phone. you don't have to tell everybody that you are home alone . you must know your parents' phone number. it have to be wise to know your neighbours .

1.i see the plane in the sky.

2. a lot of factories polute our atmosphere.

3. sun is the biggest star in our galaxy.

4. people went to the moon in the 20th century.

1. прошедшее время глагола  (past indefinite tense),  iii форма глагола  (past participle)

2. iii форма глагола  (past participle), прошедшее время  глагола  (past indefinite tense)

3.  прошедшее время  глагола  (past indefinite tense), 

4.  iii форма глагола (past participle), прошедшее время  глагола  (past indefinite tense),  прошедшее время  глагола  (past indefinite tense)

5.  прошедшее время  глагола  (past indefinite tense),  iii форма глагола (past participle),  iii форма глагола  (past participle)

6.  iii форма глагола (past participle),  iii форма глагола (past participle),  прошедшее время  глагола  (past indefinite tense)

1. однажды они приземлились на красивый остров, покрытый плодовыми деревьями.

2. каждый месяц завод, оборудованный современной машиной, перевыполнял свой план.

3. он посетил круг, организованный одним из известных художников.

4. невысокий, хорошо одетый джентльмен прибыл в отель и занял лучшую комнату.

5. я последовал за ним  на вершину  лестницы и  там прямо  под крышей  было несколько  пустых и  грязных  маленьких комнат, не покрытых коврами и незанавешенных.

6. неудовлетворенный системой высшего образования и испытывая финансовые затруднения джек лондон хотел бросить свою учёбу.

it was ten o'clock at night. eddie was tired and hungry. he spent the last five hours talking to the company's senior managers. he realized that he would have to resign from his job, and also that was facing the possibility of going to prison. six months ago, everything was fine. he had a wonderful job and he made a lot of money. then he met some people who advised him badly. they gave him a list of companies and told him to buy their shares. he had to use the company's money to do this. at first the shares were rising, so he bought some more. everything seemed so easy. then the stock market crashed and he lost everything. eddie telephoned his wife before leaving the office. he apologized for not phoning earlier, explaining that he had a difficult meeting. "you sound upset. anything wrong happened? " she asked. "i’ll tell you about it if you want when i get back," he replied.