1) The only question I had wrong was question seven .
EXCEPT
poprawna odp : I had all the question right except question seven .
moja odp : I had everything right except question seven.
Wydaj mi się, że jest poprawnie.
2) "You really must stay the night " he said to us .
INSISTED
poprawna odp : He insisted on our staing the night
moja odp : He insisted that we should stay the night.
Poprawnie, możesz to także bez 'should' napisać stosując Present Subjunctive: "...that we stay the night."
3) How likely is she to win the rice ?
CHANCES
poprawna odp : What are the chances of her winning ?
moja odp : What are the chances that she would win ?
Tu bym raczej powiedział [jeżeli tak ma być] "...that she will win."
4) Dawid was too ill to go camping with us
ENOUGH
poprawna odp : David wasn't well enough to go camping with us .
moja odp: David wasn't healthy enough to go camping with us.
[literówka] Ale również nie ma tu błędu.
5) I don't have much money so I can't go on holiday
COULD
poprawna odp : If I had more money I could go on holiday.
moja odp : If I had money I would go on holiday.
Tu jest mała różnica między tymi dwoma zdaniami - pierwsze sugeruje, że nie mam wystarczająco pieniędzy, a druga, że nie mam w ogóle pieniędzy.
6) On arriving at an airport , I usually go straight to the check-in desk
SOON
poprawna odp : I usually go straight to the check-in desk as soon as I get to an airport.
moja odp : I usually go straight to the check-in desk as soon as I arrive to an airport.
'arrive' nie łączy się z 'to', mówisz arrive in Poland [do miast, państw] lub arrive at an airport. [do budynków]
I pamiętaj, praktycznie nie ma takich testów otwartych, by tylko jedna odpowiedź była poprawna.