Make questions for the underlined part in each sentence.
1. The Olympics Games are held Once four years.
2. The children are playing tug of war.
3. The first Olympic Games took place in Greece in 776 BC.
4. Pelé began his carrer at the age of 15.
5. I really like swimming because it helps me keep fit.
( Mấy chữ in đậm đó là gạch chân các bạn thông cảm nha.)