I couldn’t _____ . The line was busy.

A、go by

B、go around

C、get in

D、get through

Wow! I’ve burnt myself! How did you do that? I ____ a hot pot.

A、touched

B、kept

C、felt

D、held

The president spoke at the business meeting for nearly an hour without _____ his notes.

A、bringing up

B、referring to

C、looking for

D、trying on

Everybody in the village likes Jack because he is good at telling and ____ jokes.

A、turning up

B、putting up

C、making up

D、showing up

What shall we use for power when all the oil in the world has _____?

A、given out

B、put out

C、held up

D、used up

Modern plastics can _____ very high and very low temperatures.

A、stand

B、hold

C、carry

D、support

His idea of having weekly family meals together, which seemed difficult at first, has _____ many good changes in their lives.

A、got through

B、resulted from

C、turned into

D、brought about

John is leaving for London tomorrow and I will ____ him ___ at the airport.

A、send; away

B、leave; off

C、see; off

D、show; around

The company is starting a new advertising campaign to _____ new customers to its stores.

A、join

B、attract

C、stick

D、transfer

根据强化的目的和性质，强化可分为( )。

A、积极强化与消极强化

B、正强化和负强化

C、自然强化物和人为近似强化物

D、强化和惩罚