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.

2. Before the nuclear disaster in the 1980's, people
grow everything in their gardens.

3. Steve
solve this problem now. He needs time.

Mary was cooking a salad at 7 o'clock yesterday.

They were argueing when I entered

Bill was surfing the net when the dootbell rang.

я люблю лето, но холодная погода тоже весёлая, и я люблю её больше. это классно делать снеговиков, и играть в хоккей. у нас во дворе есть большой склон, и мы там катаемся на санках и на коньках

      i need a part-time job to earn some money, i have read some  advertisements, and i  decided  to chose a  baby-sitter  job. 

      first of all i like kids so much. i can play with the all day. i  always  wanted to have a lot of  younger brothers and sisters.

          second - the family offers a good money for this job. that is important for me too.

at last, but not at least they sad, that they would take me to the cruise with them this summer, so i could help them with their kids there. what could be better then that?