They devote themselves to helping the poor_______.

A.wait

B.waiting

C.being waited

D.to wait

By doing mock tutorials in the learning circle, the students hope to

A．practise by themselves first.

B．help each other by giving practical advice.

C．gain self-confidence.

What must visitors do when they arrive？

A．Call the office they are visiting

B．Admit themselves

C．Leave before closing

D．Sign in

Which of the following statements is INCORRECT？

A．White-collar workers would place themselves in a different class.

B．People with different jobs may place themselves in the same class.

C．Occupation and class are no longer related with each other.

D．Changes in the workforce have made it difficult to define class.

Why did the guards shoot at the prisoners？

A．To break up a fist fight.

B．To protect themselves.

C．To prevent death threats.

D．To cover up the fight.

Which of the following statements is INCORRECT？

A．White-collar workers would place themselves in a different class.

B．People with different jobs may place themselves in the same class.

C．Occupation and class are no longer related with each other.

D．Changes in the workforce have made it difficult to define class.

A.adopt

B.keep

C.adapt

D.devote