1.Theythought______importanttolookrightandleftwhen_____theroad.A.it's;crossB.it；tocrossC.it;crossingD.itwas;tocross2.Middleschoolstudents_____(tell)nottosmoke.3.Theworld______(divide)intosevencontinents.4.Havetheydonewh

　　1.Theythought______importanttolookrightandleftwhen_____theroad.

　　A.it's;crossB.it；tocrossC.it;crossingD.itwas;tocross

　　2.Middleschoolstudents_____(tell)nottosmoke.

　　3.Theworld______(divide)intosevencontinents.

　　4.Havetheydonewhattheycan_____(stop)theenvironmentpollution?

　　5.Canyoutellus______tonight?

　　A.whatTVprdgrammeswewatched

　　B.wewatchwhatTVprogrammes

　　C.whatwewillwatchTVprogrammes

　　D.whatTVprogrammestowatch

　　6.Itwas_____difficultproblemthatIcan'tworkitout.

　　A.suchB.soC.suchaD.too

　　我要有详细的解题分析和过程