1.A nature reserve for whiteflag dolphins was set up in1992,

1.A nature reserve for whiteflag dolphins was set up in1992,___boats have been prohibited from sailing since then.
A,where B,when
2.We ___that all the decisions and plans adopted Will play an important role in the development of the great cause.
A.are convinced B.convince C.will convince D .were convinced
3.The man has launched a program___people should do as much as they could do to help people in the.earthquake
A.that B.what C.when.D.which
4.__hi.you seem to have been away for a while
___Yes,i( )with my grandma for several weeks
A.have lived B.have been living C.lived D.had lived