[khaled_A]

mr osama asked me if my parents (know - knew - had known - known ) where i was
had known

hesham asked if i (had had - have - had - am having ) thirty five pounds he could borrow
had

if you ride the bus to sharm elsheikh it (would take - will take - takes - took ) seven hours to get there
takes

climbing mount everest ( must be - cannot be - must have been - canىot have been ) the oxygen is very thin at the top

if it goes on raining for much longer the river (will flood - would flood - floods - is flooded )
will flood

if you strip the bark off a tree it (dies - die - will die - is dying )
dies

if iam thirsty i (drink - will drink - drank - would drink )water
drink