1.explaining
2.expected
4.been done
1.must been thrown away
2.couldn't been taken
3.instead of
4.to do with
ps：自己写的，好多年没用了，可能拼写有错的，不过大部分该是对的。
1. explaining
2. expected
3. finished
1. must be thrown away
2. can't be taken
3. rather than
4. to do with
1 explaining
2 expected
3 finished / been over
1 must be thrown away
2 can't be taken
3 instead of
4 to do with
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