After a long walk, they have ________.

A. given in               B. given back          C. given out          D. given over

We must ___ on our study..

A. concentrate  B. concentrate at  C. concentrate on D. concentrate with

He 1eft word with his secretary that she should keep it___    secret for_____      moment．

A．the；the          B．the；a           C．a(chǎn)；不填          D．a(chǎn); the

All these changes will lead to _____ stronger and powerful China, _____ country that can surprise and enrich our planet.

A. a; a               B. a; the             C. the; a             D. the; the

Look! Tony, your books are everywhere. Please put them _______ .

A. on order           B. in order         C. at order       D. out of order

--What’s ___ at the theatre this evening ?---It's ____ Comrade Leifeng.

A. in ; on   B. about; on   C. on, about    D. on, for

We should pay much attention to ______ people’s living conditions.

A. improve     B. improved         C. improving      D. improvement

—You look tired.  

—Yes. I _____ non-stop until twelve o’clock.   

A. hasn’t been working B. wasn’t working  C. was working   D.didn’t work

Mary wanted to travel around the world all by herself, but her parents did not___her to do so.

A. forbid             B. allow         C. follow      D. ask

Lucy switched on the engine and the car _______ in a cloud of dust.

A. set out                  B. set about               C. set off                   D. set down