A.lie | B.has | C.have | D.is |
A.is | B.being | C.was | D.be |
A.operating | B.designing | C.replacing | D.exploring |
A.broke up | B.broke out | C.burst out | D.burst into |
A.blocking out | B.preventing from | C.blocking in | D.taking off |
A.burst out | B.fell about | C.felt about | D.burst into |
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