sentence completion

hello,

I'm preparing for the exam. My task is to complete the sentences. The first sentence, part of the second sentence and one word that should be used and caanot be chaged are given (in black), what I added is in blue.' I must use between 3 - 8 words, including the given one.

Please, could you check it? some of them sound strange to me so they are probably wrong or there are better (more natural) versions.

1. I hope one day we can agree more favourable terms. reach
I hope one day it will be possible to reach an agreement on more favourable terms.

2. Some supermarket beef can be rather tough. tendency
Some supermarket beef has the tendency to be rather tough.

3. Would you kindly inform everyone of the change of procedures? wonder
I wonder if you are so kind as to inform everyone of the change of procedures?

4. Maybe I could have helped you. possible
Maybe I was possible to help you. ( i'm confused with this one)

5. In the end we were able to communicate with sign language. message
In the end we succeeded in getting our message across with sign language.

thank you