12. We ... for three hours before we decloed to take a break
a)must be trekking b)had been trekking c) have been trekking
14 . a good way to .. a problem is to think about it calmly and carefully
a)win b)beat c)gain
22.there was thick black ... coming out of the burning building
a)fog b)smoke s)smog
24. mark said that he ... a great team in london the previous summer
a)had had b)would have c) has had
28. what time does the train .. bristol?
a)arrive b) get c)reach
29 .neither annabel .. sue has ever flown in a plane.
a)or b) and c)nor