I think Kate will come if she _______ free this afternoon.
A:is
B:will be
C:was
D:are
某个春季低温潮湿、夏季高温干旱的地区生长着一种春、夏季叶型不同的植物,其叶型数据如下表。试推断( )
—Did you see _______ at the door? There is a boy waiting for you.
—No, I saw_______.
如图.已知点B在线段,AC上,M是AB的中点,N是AC的中点,若BC=4cm,则MN=____ cm.