题目内容

She ______ down and soon fell asleep.

A. live
B. lay
C. laid
D. lain

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Some birds migrate to the south when ______.

A. does winter come
B. comes winter
C. winter comes
D. winter will come

We ______ (have to, must) be modest.

He is going to catch the 5:30 train. He ______ (must, will have to) leave early tomorrow.

设α1＝(1，2，－1，0)T，α2＝(1，1，0，2)T，α3＝(2，1，1，0)T，若由α1，α2，α3形成的向量空间的维数是2，则a＝_______．