All the __________ blood must be tested for HIV and other infections, which is important for the patients. 【选项
Scientists think that the continents today _______ always where they _______.
Scientists think that the continents _______ always where they ___today.
--- Would you tell me ______ you want your tea with sugar or milk? --- Sugar, please.
--- Would you tell me ______ you want your tea, with sugar or milk? --- Sugar, please.
Leaves are found on all kinds of trees, but they differ greatly _______ size and shape.