Вопрос по английскому языку:

У меня не очень хорошо с грамматикой,У меня не очень хорошо с грамматикой, помогите пожалуйста!
Open the brackets to complete the text.
A present from Chicago.
That year the winter in Chicago (to be) very bad. One morning, when railway workers (to come) to the station, they (to see) a lot of snow that (to fall) the night before. The workers (not to know) what to do with it. They (not to see) so much snow. They (can) not leave the snow on the platforms because it (to be) dangerous for passengers.
Suddenly one of the workers (to have) a wonderful idea. The workers (to put) the snow on the freight train and (to send) it south to Texas. The workers (to think) that the snow (to melt) away on the way.
The next day five tons of snow (to arrive) in Oklahoma City. The raiway workers in Oklahoma City (to be) very happy when they (to see) what Chicago workers (to send) them. "It's a wonderful present," they said and (to put) the snow on the children's playgrond. Some of the children in Oklahoma City never (to see) snow before!