Give the correct form of the words in brackets
1. An international meeting on ( economy ) ................ development took place in Singapore last week
2. The USA í a world leader in space ( explore ) .......................
3. The ( invent ) ............. of the computer is one of the biggest achievements in the 20th century
4. It seems ( nature ) ............... for a child to spend so much time by himself or herself
5. Advences in ( medicine ) ................. science will help people live longer in the future
Giúp vs TT