The two old men ______ each other since 1970.
Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous.
Boris has brain. In fact, I don’t think that anyone in the class has ________ IQ.
— What do you think of the young lady?— She is hard-working. She ________ all her effort into her work before she got ill.
The cost of living in Chengdu is among the lowest in China, ________ the quality of life is probably one of the highest.
— Do you have any plans for the winter holiday?— Since you are crazy about music, why not go to some ________ concerts?