－________ is the spring?

－From March to May．

When

what time

How long

How soon

He began to work ________ the railroad in 1904．

out

at

for

on

－How long did it take to finish ________ the bridge?

－About half a year．

build

building

to build

to building

－What does she do?

－________．

She's my sister

She can dance

She's an engineer

She is at home

－What do you think of the book?

－________．

It's about Chang's

Very much

It's very interesting

It's 5 yuan

The Chinese government wanted a Chinese engineer ________ it．

built

build

building

to build

Zhan Tianyou was ________ a railroad．

a engineer of

a engineer for

an engineer of

an engineer for

They are ________．

nation hero

nation heroes

national heroes

national heroes

They help you ________ it．

understand

understanding

to understanding

understands

________, he joined the Chinese space programme with thirteen other pilots．

Eleven years later

Eleven years before

Eleven year before

Eleven years