Complete the sentenes. use can ,can't must ,mustn't. 1)can you hear anything ? - no, i 2) it's dangerous. matt be careful. 3) they walk there in ten minutes.it isn't far. 4) it's late. she to bed. 5) i my arm. i think it's broken . 6) stay at the youth hostel? -yes,you can. 7) .be quite! 8) ben wants to go skateboarding but he his skateboard.