______ this medicine before you go to bed, OK?
A. Taking
B. To take
C. Take
D. Took
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______ warmly and you won’t catch a cold.
A. Dress
B. To dress
C. Don’t dress
Dressed
______ interrupt me when I am speaking. It’s rude.
A. Please
B. Please not
C. Please don’t
D. Pleased
Walk two blocks and ______ left on Oak Street.
A. turning
B. turn
C. turned
D. turns
体内进行嘌呤核苷酸从头合成的器官是()
A. 胸腺
B. 骨髓
C. 肝
D. 脾