I blew it with my captaincy last round, i'd be in first if I hadn't

I had to change the captaincy everyday because all the strikers I had were disappointing. In the end I played it on Bonucci cuz I knew the English wouldn't score.
I made CR7 my captain, he scored, I took a gamble and said Germans are gonna beat up on Greece (which they did) but cot damn Gomez didn't play
Then I made Pirlo my captain but switched to Cassano at the last minute cause i was convinced he would score against the England. FAIL
I have no clue how to play these semi's walaahi