directions:Complete each sentence with the right modals. choose from the modals inside the box.
could must can't mustn't can
1.children____obey their parents
2._____i borrow your pen for a moment,please?
3.you_____take photos in the museum,they're really strict about it,
4.you_____wear a seatbelt when you drive.
5.they_____still be waiting for us.
6._____i sit beside you?
7.sorry,you______use this chair.
8.ma'am______i go to the bathroom?
9.he______be lost
10.children______tell lies. it's very naughty.
11.you_____wear the uniform at all times.
12.they_____go to the party this afternoon.
13.you______enter the school gate without an id.
14.we_____wear a facemask when we go outside.
15.stop,they______hear what we are saying.​