1.You must stop playing computer games.
= You must (give up) playing computer games.
2.You can only choose one out of the two shirts.
= Please take (either) this shirt (or) that one.
3.Marcia's blouse is purple,and LInda's blouse is purple,too.
= Linda's blouse is the (same colour) as Marcia's.
4.Half an hour ago,Harry Potter began.
= Harry Potter has (been on) for half an hour.
5.“Is the Palace Museum free for teenagers to visit?”she asked
= She asked (if/whether) the Palace Museum （was）free for teenagers to visit.