As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
A.
before
B.
unless
C.
since
D.
until
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【单选题】There is someone knocking at the door. it be Tom?
【简答题】Tom will have dinner with his friend at 6:00 tonight. 2.Tom will bring some flowers with him. 3.Tom will be with a customer at 7:00 tonight. 4.Tom's girl friend is a gardener. 5.Tom has a garden.