The boy wanted to ride his bicycle in the street, but his mother told him ________.

[　　]

By________ the heart ________a pump, he helped the children to understand its function.

[　　]

It's harmful for the young students to be addicted to________ computer games.

[　　]

--It's reported that the government has lightened the burden on the students.

--Oh, today we are still________ from heavy school work, ________at preparing us for the entrance examination.

[　　]

We________ each other for ten years.

[　　]

A．have been in contact with

B．have contacted with

C．contact with

D．have been contacted

What he said at the meeting________ my attention.

[　　]

The robbers ________ him ________his money.

[　　]

We should make sure________ the plan

[　　]

The boy prefer ________to ________.

[　　]

Switch the freezer________ extra cold setting.

[　　]