I am sure he was disappointed about leaving the research group. He ...... disappointed about leaving the research group. (have), must have been, must have be, have been, can have been, They should have analysed all the tissue samples by now. (due) All the tissue samples were.... by now., due have been analysed, due to have been analysed, due to had been analysed, due to must be analysed, I'm certain Dr Lee was very eager to carry out his experiment in public. (willing) Dr Lee ...... to carry out his experiment in public., must be willing, is willing, must have been willing, have been willing, I thought Ryan wrote the research paper. (supposed) Ryan was ..... the research paper., supposed to have written, supposed to write, supposed being written, supposed have written, I am sure they have proved their theory by now. (bound) Their theory is ...... by now., bound to have been proved, bound to prove, bound to be proved, bound to have be proved, It's fortunate that the accident didn't destroy all the tissue samples. (Have) The accident ..... all the tissue samples. Fortunately, it didn't., could destroy, could have destroyed , have destroyed , could to destriy.

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