What does the idiom 'Cost an arm and a leg' mean?

A word that sounds the same as another but has different meaning is called:

Choose the correctly corrected sentence: 'I have saw that movie already.'

Choose the correct preposition: The book consists ____ ten chapters.

Fill in the blank: You must finish your homework ____ you can watch TV.

Choose the word most opposite in meaning to 'Deceitful'.

Choose the word most similar in meaning to 'Impeccable'.

Choose the word most similar in meaning to 'Scrutinize'.

Choose the word most opposite in meaning to 'Fragile'.

Fill in the blank: The sun ____ in the east.

Choose the correct preposition: They arrived ____ the airport early.