1.The ... ... ... (large) iceberg in the world was 31,000 km long and 97km.wide. 2. The... ... ... (expensive) piano in the world cost $390,000 in 1980
3. The ... ... ... (old) museum in the world in the Ashmolean Museum in Oxford
4. The ... ... ... (heavy) person of all time was Jon Brower Minnoch. He weighed more than 422kg
5. The... ... ... (dangerous) animal on earth is probably the mosquito

1.The largest iceberg in the world was 31,000 km long and 97km.wide.

2. The most expensive piano in the world cost $390,000 in 1980.

3. The oldest museum in the world in the Ashmolean Museum in Oxford

4. The heaviest person of all time was Jon Brower Minnoch. He weighed more than 422kg

5. The most dangerous animal on earth is probably the mosquito

Объяснение:

Превосходная степень сравнения прилагательных:

либо the + -(e)st, *the oldest*

либо the most *the most dangerous* (как правило, с многосложными прилагательными, из двух и более слогов)