Điền từ vào chỗ trống: Vietnam is in the South-East Asia.It has......................of beautiful mountains,rivers and beaches.  .......................are two long..................in Vietnam:The Red river in the north the Mekong river in the.................. .The Mekong river is the ................river in the South-East Asia and of course it is longer. ..................the Red river.The Mekong river starts in Tibet and .....................to the Bien Dong. Phanxipang is....................highest mountain in Vietnam. It's 3,143 meters................. .Vietnam also ...............many nice beaches such as Sam Son,Do Son,Nha Trang,Vung Tau.