Complete the sentences using the past simple or present perfect. 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 /...

Complete the sentences using the past simple or present perfect. 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).