— Why are you so busy, Mike? — I ____ a novel these days. [ ]

Sit _____ you like

ood news! Such a successful gene ______ in pigs that it enables the pigs to produce human serum albumin, a protein made by the liver. Look! Here ________.

Kate will arrive Harbin the morning of July 5 by plane.

We are often warned that smoking ______ great harm to our health.