c1: when do they go to the beach?
c2: where are you/we staying?
c3: why doesn't Mai stay in the water very long ?
c4 what does Minh play on the beach ?
c5: who is going to be a president of the stamp collector 's club?
c6: which is the favourite pastime of chi and lan ?
c7: waht does Nam like very much ?
c8: how does lan play the violin very well?
c9: when shoud i come to see Huong?
c10: what does Chi often go to the art club to do?