Question

  giúp e vớiii

Answer 1

1. Have - Discovered 

2. Have not found 

3. Had taken - got 

4. Has been building - started 

5.  Have bought 

6. Has spread 

Answer 2

1 Have - discovered

2 haven't founded

3 had taken - got

4 has built - started

5 have bought

6 has spread