2) Last Sunday (is/was) we didn't go for a walk. 3) In summer the sun in the sky. 4) It is a very pleasant da is shining) blowing) and

Ответ: was, shines, is blowing

1. Last Sunday (is / was) a nasty day, and we didn't go for a walk. (was, так как речь идет о прошедшем времени - в прошлое воскресенье)
2. In summer the sun often (shines / is shining) in the sky. (shines, так как действие происходит регулярно, а не в данный момент)
3. It is a very pleasant day today: the sun (shines / is shining) and a warm wind (blows / is blowing). (is shining, is blowing, так как действие происходит в данный момент)

Ответ: was, shines, is blowing