Can someone please check my answers?

1. alternate/alternative
Thats what we should do - unless you have an alternative suggestion. I visit my parents on alternate weekends.
2. ingenious/ingenuous
You would have to be completely ingenious to believe a story like that. The ingenuous Thomas Edison patented hundreds of inventions.
3.suit/suite
He showed up in a new silk suit. Her suite includes advisors, secretaries and bodyguards. They gave us a beautiful suite of rooms at the hotel.
4. draft/draught/ drought
This is only the draft of my speech. There is an awful draught in here. Some areas in Africa were affected by drought.