BIP39 Manual Phrase Calculations - How are Multiple checksums valid?
You aren't actually encoding the same entropy with different checksums. The last word does not encode just the checksum, it also encodes some portion of the original entropy. For a 12 word mnemonic, the last word encodes 7 bits of the original entropy and 4 bits of the checksum.
In your example, the last 7 bits of the original entropy is 1110010. Combined with the 4 bit checksum of 0001, the corresponding word is tomorrow.
In your second phrase, the last bits of the encoded entropy is actually 0000000 which changes the checksum bits to 1100 so you get a different word, account.
In your third phrase, the last bits of the encoded entropy is actually 0000001 which changes the checksum bits to 0000 so you get another word, acoustic.
So in actuality, BIP 39 mnemonics have unique last word because it is a combination of the original entropy with the checksum which is unique. Changing the entropy bits changes the checksum, and changing the checksum invalidates it.

Original answer which is still correct but not applicable to this question.
A careful reading of BIP 39 shows that there are not multiple words which fit the checksum. Rather the BIP is so broad that invalid checksums are allowed and should only be warned against.
In your example, the second phrase is actually invalid. But BIP 39 says that such invalid phrases should be allowed, and so the wallet software will allow it. The checksum is effectively ignored and not checked (which kind of defeats the purpose of a checksum).