10 ____ you find any cheap flights to Milan?
A) Did B) Do C) Have
13 David _____ four text messages so far today.
A) has written B) wrote C) writes
14 Chris hasn't travelled by boat 2009.
A) already B) for C) since
15 Robbie isn't here. He's _____ on holiday to Venezuela.
A) was B) gone C) been​