1.that man is the first....explored........... to cross the country from south to north .(explore)
Chỉ người (that man)- dùng danh từ chỉ người (explored)
2.my neighbours are very ......friendly......... I love them so much (friend)
friendly : thân thiện
3.......unluckily............she has hurt her hand and cannot play the piano
unluckily : Không may mắn
4.Everybody was worried because the child....disappeared.........(appearance)
Chỉ người (the child) - dùng danh từ chỉ người (disappeared)