1) We ... books and copybooks already. a) bought, b) are buying, c) have bought. 2) We... already... for the beginning of the new school year. a) prepare, b) are preparing, c) have prepared.
3) We... home by the 20th of August. a) have returned, b) were returning, c) had returned.
4) I ... some books about the North before I started travelling. a)was reading, b) read, c) had read.
5) We ... down the river at this time last July. a)sailed, b) were sailing, c) had sailed.
6) I ... to the North last summer. a)travel, b)travelled, c) have travelled
Помогите пожалуйста.