1. I tried to read a few pages, but I found it hard to ____.(concentrate)
3. He made a ____ (concentrate) effort to improve his work.

Question

Hurricane · Answer

`1` concentrate .
`-` to + V-inf .
`-` concentrate : tập trung (V)
`2` concentrated .
`-` adj + N .
`-` concentrated : tính tập trung (adj)

1. I tried to read a few pages, but I found it hard to .(concentrate) 3. He made a (concentrate) effort to improve his work.