His father is __________ engineer and he works _________

His father is __________ engineer and he works __________ research.

#49406

an, on

an, with

the , on

a, with

推荐题目

You will not find out the answer     the end of the film, and then you’ll know who he loves.

#48837

until

Whenever you meet with difficulties, you can ask the policeman ____help.

#51261

for

with

The cruel cook was guilty ______murder. He was involved _____ the case.

#47242

with, with

of, in

of, on

in, of

 –What’s that_____ English? –It’s a map.

#47596

Jane studies chemistry ________ asking the teacher ________ help.

#48275

for; by

for; to

by; by

by; for