They ... (spend) last summer in the UK.

They spent last summer in the UK.

They spent last summer in the UK.

Объяснение:

to do a crossword 

a crossword is done

is a crosswod done?

a crossword is not done

to read a book

a book is read

is a book read?

is  the book written?  

a book is not read

to recite a poem

a poem is recited

is a poem recited?

если надо поменять время, то принцип тот же

true,  students can buy bottles of water