Anne couldn’t concentrate ______what she was doing while her friends were playing cards.

A. to B. on

C. for D. in

She was so ______ in her job that she didn’t hear anybody knocking at the door.

A. absorbed B. attracted

C. drawn D. concentrated

Everyone should learn something about first aid, because every second ________ in an emergency.

A. urges B. costs

C. needs D. counts

He has ________ with his parents for playing games online.

A. fallen down B. fallen off

C. fallen on D．fallen out

This is the main use that the scientists make______ natural resources.

A. in B. up of

C. from D. of

Every minute is made full use of _______ at our lessons.

A. to work B. working

C. having worked D. being worked

It's ____________(适当)to send an email farewell letter.

Hospital staff burst into cheers after doctors completed a 20­hour operation to have ________(分离) one­year­old twins at the head.

They say that the traffic accident o_________ at midnight.

She tends to get angry when others d with her.