Swiming наверное, ибо единственное слово с ошибкой.
Ответ:
1 Where was Dave skiing?
2 Where was Dave walking?
3 What were the bears doing?
4 What were the bears eating?
5 Was Dave walking fast?
6 Was Dave swimming across the river?
Объяснение:
Present simple
1 My mother likes knitting
2 My brother works in a bank
3 My sister does yoga twice a week
4 My friend often reads newspapers
5 I usually go to school on foot
Present continuous
1 The children are playing football now
2 My granny is making a fruit cake at present
3 Listen! The girl is singing so beautifully
4 You are always shouting at me!
5 My granny is working in the garden now
6 The sun is shining at present
7 I am going to meet with my friends next week
8 My uncle is going to London tomorrow
9 Radio isn't working now
10 The doctor is conducting an operation now
Past simple
1 My parents got married in 1990
2 My friend moved to Moscow in 2000
3 My cousin worked as a lawyer from 2005 to 2010
4 I visited my granny last week
5 I bought a modern laptop yesterday
6 We danced all night long
7 Mary went shopping
8 I could play the guitar when I was a teenager
9 My sister broke her leg last winter
10 Sally watered the flowers last weekend
1)is one of the biggest
2) what is a
3) what s
5)Ann`s .... very well
7) what is the most ...
8) cheaper than tomatoes
9) this businessen goes to this city once a year
10) who told them