A. are; can't    
B. were; could  
C. were; couldn't

A. You went to see a film.
B. I went to my uncle's farm.
C. Because I was tired.

Nick: Hi, Mary. Where did you go yesterday?
Mary: I went to the sports park with my parents.
Nick: What did you do?
Mary: Dad and I went swimming. Mom and our dog, Dolly, went for a walk in the park.
Nick: Did you have a good time?
Mary: Yes, we did. We had a great time. We ate lunch in the park restaurant. But after
          lunch we couldn't find Dolly.
Nick: Dolly?
Mary: Yes, we all were sad. Then we went back home. Dolly was in our house!
Nick: Dolly walked back to your house?
Mary: Yes, he did. Now check the sentences.
a. Mary didn't go to the sports park.                            Yes□  No□
b. Mary didn't go for a walk in the park.                      Yes□  No □
c. They had a good time.                                             Yes □   No□
d. They didn't have lunch.                                            Yes □   No□
e. They were happy because they couldn't find Dolly.   Yes □   No口
f. Dolly didn't go home at last.                                      Yes □   No□