rewrite sentences: 1.unless we protect the evironment,we wil destroy ourselves: -if.......................................................................................................... 2.unless she is more hard-working,she wil get low marks: -if................................................................................................... 3.unless he listens to his parents,he wil fail. -if........................................................................... 4.they began watching the movie one hour ago: -they have................................................................................. 5.he last cried ten years ago: -he has..................................................................... 6.this is the first time he went abroad: -he hasn't.................................................. 7.she started driving 1 month ago: -she has.................................................. 8.we be gan eating when it started to rain: -we have............................................................ 9.nam likes watching televison: -nam is.......................................... 10.it's the firts time that i have ever talked to the foreigner: -i have..............................................................................................