Species become extinct when they .......... in changing habitat or against superior competition, mustn't survive , dont have to survive , need not survive , are not able to survive , should not survive, During an exam, if you read the instructions closely you ........ any questions, but of course should there be something urgent you ....... your hand first , may not have / should have raised , should not have / have to raise , did not need to have / must raise , dont have to have / need to raise , must not have had / were to have raised, Becoming a physician is a long expensive process that you ......... with great dedication, can't accomplish, shouldn't have accomplished , can accomplish, aren't able to accomplish, would rather not have accomplished, Global warming .......... 15 to 37 percent of animal and plant species by 2050, was able to wipe out , can't have wiped out , could wipe out, had better wipe out, should wipe out, Suncream .......... just for a day at the beach, it ......... provide protection every day, can't be / may not help , shouldn't be / can help, had better be / is able to help, needn't be / used to help, musn't be / can't help, You ........ any butter for the cake as we have got lots of it in the refrigerator, should have bought , must have bought , could have bought , needn't have bought, ought to have bought, To our suprise, she ........... the job although she didn't have any previous experience , could have got , can't have got , was not supposed to get , was able to get, couldn't get, Well, if she is good at singing then she ............ some song in front of us right here right now, should have sung, is not supposed to sing , can't have sung , must have sung , should be able to sing, To tell the truth, I can't remember how long I have been waiting for this e-mail but it ........... for at least two months since I last told them to inform me , had been, must have been , had to be , didn't need to be , would have been, I dont think anyone ........... this code because it is too long and complicated , can break, must be breaking , will have to break, might be breaking , has to break, I hate maths, but I .......... these forty pages for the exam next Wednesday, could be studying , have to study , can study, have had to study, needn't study, Paula ......... to the hairdresser's because she was there yesterday, mustn't go, wasn't able to go, could not go, hasn't been able to go, can't have gone, When he understood that he was wrong, Liam .......... to me for blaming me , had better apologise , could apologise, has had to apologise , should apologise, had to apologise, Tim ....... more than five times in the shooting gallery, but he ........ the target even once , might have shot / isn't able to hit , may be shooting / can't have hit , should have shot / needn't hit, could shoot / mustn't hit , must have shot / couldn't hit, You keep typing on your phone, so you ....... to me, Steve, are not allowed to listen, could have listened, can not be listening, might not listen, had better not listen.

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