The souptoo much salt．—I’m sorry, sir．I’ll change it for you

Though this question is very difficult，if you ________ trying you willfind the right answer.

_______ they are twin brothers, theydon’t look like each other.

It turned out that one of the children I thought a girl was________a boy[ ]

Are you free after school? —Sorry, I’ve planned to treat a friend of mine to dinner___for his help