1, Finish your homework or you can't go out with your friend (if) $\rightarrow$ .............................................................. 2, They're not sure how they should operate the new system (to) $\rightarrow$ ............................................................... 3, It took me 4 hours to read the first chapter of the book (spent) $\rightarrow$ ................................................................ 4, Snowboarding is more dangerous than tennis ( as ) $\rightarrow$ ....................................................................

1, Finish your homework or you can't go out with your friend (if)

$\to\to$ .........If you don't Finish your homework , you can't go out with your friend ..............

2, They're not sure how they should operate the new system (to)

$\to\to$ ........They're not sure how to operate the new system................

3, It took me 4 hours to read the first chapter of the book (spent)

$\to\to$ .........I spent 4 hours reading the first chapter of the book............

4, Snowboarding is more dangerous than tennis ( as )

$\to\to$ .............Tennis isn't as dangerous as Snowboarding .....................

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