I think Unit 9 is very easy. (变为否定句)

I ________ think Unit 9 ________ very easy.

How much time did you spend ________ the new words in Unit 9?

1. A.
   to learn
2. B.
   learning
3. C.
   learned
4. D.
   learn

I think Unit 9 is very easy. (变为否定句)

I ________ think Unit 9 ________ very easy.

Today let's ________ Unit 9.

［　　］

Today let's ________ Unit 9.

［　　］