Not until the early years of the 19th century _____ what heat is.
| A．man did know | B．man knew | C．didn’t man know | D．did man know |
Wolves are very ______: they can live in forests, on open plains, or in the snows of the Arctic.
| A．adaptable | B．adoptable | C．available | D．accessible |
His diet can not be considered as healthy because it contains a lot of fat _______ meat, cakes and cream.
| A．in terms of | B．in need of | C．in the form of | D．in favor of |
Though ____ money, the parents of the twins managed to send them to university.
| A．lacked | B．lacking | C．lacking of | D．lacked in |
—Have you got used to the Chinese food, Robert?
—Yes, but I don't like ________ when a Chinese host keeps serving me the food I don't like.
| A．this | B．that | C．those | D．it |
I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.
| A．should | B．could | C．would | D．might |