a) Complete the sentences using Past Simple or Present Perfect.
Example: They ... in a new project. (to take part / last year)- They took part in a new project last year.
1)The scientist ... his article.(to write already)-
2)Andrew's hamster ... his food,(to eat just)-
3) The boys ... an old cage in their garden. (to find yesterday)-
4) They ... the problem. (not discuss yet )-
5) Charles ... his translation. (to finish just )-
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