The farmer didn’t know ________ .

A．where he can plant the young apple tree

B．where can he plant the young apple tree

C．where could he plant the young apple tree

D．where he could plant the young apple tree

--- What did the man say to you?

--- He asked ________ I knew the way to the museum. But I didn’t know.

A．that              B．when             C．where            D．if

He didn’t know __________

A．what kind of snake it is??? B．what kind of snake is it???????

C．what kind of snake it was? D. what kind of snake was it

I didn't know ________.

1. A.
   what they do
2. B.
   what they did
3. C.
   what do they do
4. D.
   what did they do