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1 Did he know somebody in Africa?
Yes, he did.
2 Does he know...?
Yes, he does.
4. Are there some book shops..?
Yes, there are.
5 Did she tell...?
Yes, she did 3. Is there something tasty? - Yes, there is(видимо, в 3 была опечатка в учебнике. там два раза there. поэтому, видимо, правильно так: Is there something tasty? Yes there is.