Study the examples. Then, rewrite the sentences using the modals in bold. He must have left by now. ( I'm sure he left.)
They are late. They may / might have lost their way. ( It was possible. )
He can't have eaten the whole cake. (I'm sure he didn't do it.)
You should have booked a table. (but you didn't. )
1. I'm sure she didn’t do the shopping.
2. I'm sure Mum bought us some doughnuts.
3. They wanted to buy a cake dor his birthday but they didn't.
4. It was possible that she had left the invitation at home.
5. I'm sure the decorations cost a lot.
6. He isn't feeling well; he ate too many sweets.

нужно, заранее

Friendship is one of the best things in life. Everybody needs a good friend’s shoulder to cry on, or simply someone to share the joys and sorrows with. It isn’t easy to find faithful and caring friends though. We can meet many people who will pretend to be our friends, but after all the true friends don’t leave or betray. Friendship is a complex notion. People can quarrel or have some kind of conflict and still stay friends. And others, who never argue with each other, can soon split up. The same can be said about the relations among friends. Those friends, who tell you the truth even when it’s bitter, are more likely to care about you, than those who don’t. For me friendship is round-the-clock concept. If I’m friends with someone, he or she can always rely on me. My friends can call me late at night to tell about their problems. They can ask me for help or support. I am lucky to have two best friends who would do the same for me. We know each other from the kindergarten and we’ve been through many difficult situations. I hope that we will stay true friends for a lifetime or at least for a very long time. My mum often tells me that friendship is like a tree. It means that under good conditions it will grow and become rather strong. As the years pass, the tree can stand firmer and firmer on the ground. The same happens with a long-term friendship. To form a strong union of friends one should give lots of love, patience, understanding and care. This way, true friendship can survive any difficulties.

In summertime, off the eastern coast of Canada 

near Newfoundland, humpback whales gather in large groups, or
"schools" as they are 

called often "singing" to each other and making jumps out of
the water. However, if 

you were  a humpback whale,
you would have a 

problem. Today these playful and friendly whales are caught
in the nets of fishermen who would prefer to save 

them if they could. 

Jon Lien and his assistants have been helping to free whales 

from nets since 1998. More than 600 whales are being realesed

up to now. In an interview Jon stated that
recently 

our government had agreed that the rescue of
whales 

was ___an issue that should be discussed at the 

international level. But, unfortunately, today some countries, like
Japan, have 

a different view on the protection of
whales. 

Today scientists wish that the government wuld financed

the production of "whale alarms"
that would tell 

fishermen where the whales were so that the fishermen could avoid the
area when they 

go fishing.Consequently

, fishermen wouldn't lose thousands of
dollars' worth 

of nets and fish, and the whales would be saved.