I find __________ very difficult to learn English well .

A．that              B．this              C．one              D．it

I find __________ very difficult to learn English well .

I find __________ very difficult to learn English well .

1. A.
   that
2. B.
   this
3. C.
   one
4. D.
   it

I find ________ very important to study English well．

1. A.
   myself
2. B.
   that
3. C.
   this
4. D.
   it