The missing children haven’t been found yet. Something terrible ________ to them.

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may happen should have happened must happen might have happened

has opened; haven’t gone has been open; haven’t been has been open; haven’t gone has opened; haven’t been

hadn’t met didn't meet haven’t met wouldn’t meet

don’t miss haven’t missed am not missing didn’t miss

has lost;don’t find is missing;don’t find has lost;haven’t found is missing;haven’t found

miss, loss missing, loss missed, loss missing, lost

has lost; don't find is missing; don't find has lost; haven't found is missing; haven't found

got lost；don’t find is missing；don’t find have got lost；haven’t found is missing；haven’t found

has lost; don’t find is missing don’t find has lost; haven’t found is missing; haven’t found

has lost ,don’t find is missing, don’t find has lost, haven’t found is missing , haven’t found

has lost; don’t find is missing; don’t find has lost; haven’t found is missing; haven’t found

has been going on; haven’t reacheD. has been going on; haven’t been reacheD. was going on; haven’t reached was going on; haven’t been reached

shall would must can

Yes，they have No，they haven’t Yes，they haven’t No，they have

has lost; don't find is missing; don't find has lost; haven't found is missing; haven't found

is missing; haven't found is missing; don't find has lost; haven't found is lost; don't find

has lost; don’t find is missing; don’t find has lost; haven’t found is missing; haven’t found

has lost, don’t find is missing, don’t find has lost, haven’t found is missing, haven’t found