You are an ACC controller. Listen to the position reports and request to report the omitted point. Practise the exercise several times:
Example: ACFT: Angola 676, BW (at) 09, estimate DN (at) 39, KB next.
ACC: Angola 676, report flight level and report DN.
ACFT: FL 190, Angola 676.
1) ACFT: Speedbird 711, BL (at) FL 190, estimate CN (at) 47.
ACC: …
ACFT: time 31, Speedbird 711.
2) ACFT: Swissair 354, CD, (at) FL 290, DW next.
ACC: …
ACFT: Estimate DO 03 next hour, Swissair 354.
3) ACFT: Scandinavian 350, FL 260, estimate EL 58.
ACC: …
ACFT: NO at 45, Scandinavian 350.
4) ACFT: Air India 112, OP 47, FL 220, estimating PB 58.
ACC: …
ACFT: next reporting point YN 05 next hour, Air India 112.
5) ACFT: Air France 815, WB (at), TM 30.
ACC: …
ACFT: FL 280, Air France 815.
6) ACFT: Alitalia 548, passing SB, revised estimate KB 22.
ACC: …
ACFT: Passing KB 22, FL 310.