1. the austrian army should [beat/ have beat] the french army as soon as they arrived, as they outnumbered the french two to one.

에서 have p.p가 정답인데 should beat 하면 안되나요? 의미상 이겨야했다가 되지않나요?2. the french were thus able to take the austrians by surprise, and after six hours of fighting, victory was [them/theirs].

were able to 사이에 thus 어떻게 해석해야하나요?