раскрыть скобки : Where your customers (to spend) their holidays? - They (to be) in the Caucasus. They (to go) to a spa there. Why Peter the Great send young Russians to Holland and Italy? - He(to send) them to study navigator. What kind of travel the «Grand Tour» (to mean)? – It to mean) travel of young and wealthy upper-class noblemen in the 17th and 18th centuries. They (to undertake) regular educational trips to European countries.

Where do your customers spend their holidays

They are in the caucasus

They go to a spa

He sends them to study navigator

What kind of young the grand tour means

It means travel

They undertake regular

This hi-tech bikini (1) contains small solar panels (2) which can power your iPod, so you can listen to music all day while you're on the beach. Andrew Schneider, the designer (3) who created the idea, (4) is working on a pair of solar shorts too. Apparently, these can create enough energy to cool your drinks. Obviously, the solar panels only work in places (5) where the sun shines. But Schneider (6) doesn't think that's a problem, because people hardly ever (7) go to the beach if it isn't sunny. Just be careful if you (8) like swimming. Remember to dry your bikini completely before you plug in your music!

Write what you had done yesterday:

a)  by the time your parent(s) came back home

b)  by the time supper was ready

c)  by 6 p.m.

d)  by the time you came back from school

e)  by bedtime

a) I had done my homework by the time my parents came back home.

b) I had checked my mail by the time supper was ready.

c) I had finished reading another book by 6 pm.

d) I had cleaned up the room by the time you came back from school.

e) I'd finished playing computer games by bedtime.

   ( = listening to music by...;  = watching TV by...)

Объяснение:   had + V3+ by - к какому-то времени; до какого-либо времени что-то было уже сделано.