1.(-)they weren't in rio last summer

   (?)Were they in rio last summer

2.(-)We didn't do our exercise this morning.

(?)Did you do your exercise this morning?

3.(-)My parents didn't come to visit me last July.

(?)Did your parents come to visit me last July?

4.(-)The hotel wasn't very expensive.

(?)Was the hotel very expensive? 

5.(-)I didn't have a bicycle when I was young.

(?)Did you have a bicycle when you was young?

6.(-)The children didn't go to the zoo yesterday.

(?)Did the children go to the zoo yesterday?

7.emie ate the last doughnut

(-)emie didn't eat last doughnut

(?)did emie eat last doughnut?

8.they bought a new house last month

(-)they didn't buy a new house last month

(?)did they buy a new house last month?

1)

(?) Were they in rio last summer?

2)

2)

(-)We didn't do our exercise this morning.
(?)Did you do your exercise this morning?
3)

(-)My parents didn't come to visit me last July.
(?)Did your parents come to visit me last July?
4)

(-)The hotel wasn't very expensive.
(?)Was the hotel very expensive? 
5)

(-)I didn't have a bicycle when I was young.
(?)Did you have a bicycle when you was young?
6)

(-)The children didn't go to the zoo yesterday.
(?)Did the children go to the zoo yesterday?