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2 comprehension and grammar
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When firstdid key locks appearedfirst appear?

When and where appeareddid the first metal key locks appear (not the door bolts)?

When did they became widespread?

When first key locks appeared?

When and where appeared the first metal key locks (not the door bolts)?

When they became widespread?

When did key locks first appear?

When and where did the first metal key locks appear (not the door bolts)?

When did they became widespread?

1
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When first key locks appeared?

When and where appeared the first metal key locks (not the door bolts)?

When they became widespread?