(5分)You have probably seen on TV how whales jump out of the sea or slap (拍打＞the water with their fi...

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Have, seen, have, seen Did, see, did, see Have, seen, did, see Did, see, have, seen

A. would have seen must have seen may have seen can have seen

Have… seen… did… see Did…see…die…watch Have…seen… have… seen Did…see…have…seen

Much as I have travelled As long as I have travelled Now that I have travelled so much As I have travelled so much

I never have seen　 never I have seen　 never have I seen　 I have seen

heard heard of listened to listened

Have you seen; have seen Have you seen; saw Did you see; have seen Did you see; saw

Did you see; did you see Have you seen; did you see Do you see; have you seen Have you seen; have you seen

done taken built programmed

If you were read As you read Read Reading

since when after before

shortly currently lately probably

may not sit in the library probably don't know its background may not have practiced on reading it probably think it is too easy for you to read

Much as I have travelled As long as I have travelled Now that I have travelled so much As I have travelled so much

can’t have seen should not have seen must not have seen need not have seen

shortly currently lately probably

a second time and you quite a different described