1 . When workers are organized in trade unions, employers find it hard to lay them ______.

A．off

B．aside

C．out

D．down

2 . It is naive to expect that any society can resolve all the social problems it is faced with ______ .

A．for long

B．in and out

C．once for all

D．by nature

3 . When the engine would not start, the mechanic inspected all the parts to find what was at ______.

A．wrong

B．trouble

C．fault

D．difficulty

4 . The Timber rattlesnake is now on the endangered species list, and is extinct in two eastern states in which it once ______.

A．thrived

B．swelled

C．prospered

D．flourished

5 . The director of the research institute came in person to ______ that everything was all right.

A．make out

B．make sure

C．make clear

D．make up

6 . Giorgio, now fifteen, and Lucia, also in her teens, were reaching the ______ of their adolescence.

A．crisis

B．criterion

C．causality

D．credibility

7 . Just relax and be confident, and you won't _____ when you give your speech.

A．stumble

B．jumble

C．tumble

D．rumble

8 . The program is 90 minutes of_____ Indian folk dance, live music and storytelling.

A．diplomatic

B．heroic

C．dynamic

D．specific

9 . No supportive words could ever_____ for the pain of being separated from her children for 10 years.

A．compensate

B．compromise

C．commence

D．compliment

10 . Gradually some of them get used to depending on their parents and lack the ability to solve problems _____.

A．independently

B．individually

C．irrespectively

D．dependently