Помогите выбрать-could, can, mustn’t, have to, needn’t, may, should, don’t have to

Question

1Our company ...easily enter the foreign market. 
2 They ...transport their products by rail. 
3 We ...reject a proposal without presenting it to the meeting. 
4 We ...have driven to the city in two hours if we hadn’t stopped for lunch

thank you very much!!!

Наталья Миронова · Accepted Answer

1Our company can easily enter the foreign market. 
2 They shuld transport their products by rail. 
3 We mustn't reject a proposal without presenting it to the meeting. 
4 We could have driven to the city in two hours if we hadn’t stopped for lunch 
(Хотя и другие модальные глаголы тоже можно было выбрать)