Choose the corret option (A,B,C or D) to complete the following passage.    16.A is going  B.are to   C.are going to    D.had to    17.A to       B.by     C.with    D.for   18.A many   B.some    C.few   D.lot    19.A help   B visit   C ask     D.go    20.A to  B.from  C.for   D.on   Tony and his firends (16)............................have a trip to Vietnam next summer.At first,they are going to Hanoi (17)..............................plane and they are going to stay there in two days.Then they are going to travel to Ha Long and Hue.They are going to visit (18).............................of places  of  places  of interest and some primary schools in Hanoi.They are going to (19)....................students in the schools practice speaking English.Finally,they are going to fly back to England (20).......................Hanoi.        Giúp mik vs ah mik đg cần rất gấp !!! R mik k cho ah