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#1 ABC
his
DEF
pig
GHIJK
swims

ответ: His pig swims. - Его поросенок плавает. His dog swims. - Его собака плавает, может быть и такой вариант, в зависимости от года издания книги .

1. The sanitary engineer is concerned with hydrology. - Present Simple Passive

to concern

2. Different systems of water filters are used in present day. - Present Simple Passive

to use

3. Water finds its way to the rivers. - Present Simple Active

to find

4. Ocean water contains salt and other mineral materials. - Present Simple Active

to contain

5. The earliest written records of water purification date to 2 000 B. C. - Present Simple Active

to date

6. The modern recreation center has been erected in the center of Moscow. - Present Perfect Passive

to erect

1. You probably put the key in the wrong place, and I could not enter the house.
2. I was surprised to see so many people in the hall where I had to perform.
3.Maybe she was at the concert, but I did not see her.
4.Your face seems
To me familiar. We must have met somewhere.
5.In vain did you tell her about it. You should not have said anything.
6.It can not be that he does not hear about
our decision, but I'll still tell him myself.
7.He must not be
had time to read this book or, perhaps, did not get it.
8.He asked
to warn that you may have to wait another two to three days,
Before he can accept you.
9.The operation should be done on the 10th, but
in view of the poor state of the patient, it had to be postponed indefinitely
time.
10.It can not be that she does not know this.
11.He must be,
prepared a translation in advance.
12.He must not have prepared the translation in advance.
13.He probably did not have time to prepare the translation and was (will) be forced to
spend it all Sunday, because it needs to be completed by the next
week.
14.Could you help me finish the job? To me, maybe,
will have to leave tomorrow night.