I think the reason（ ）so many people got engaged in this project is that they share the same vision.

Fill in the blanks with an item as required.

​With an appropriate relative pronoun or relative adverb: 

The business of the company has reached a point  a change is needed.

Fill in the blanks with an item as required. 

With a relative pronoun：

With the police ’ s persistent efforts, all had been stolen was returned to its rightful owner.

Fill in the blanks with an item as required. 

With a relative pronoun：

Just as Jerry got level with the top of the broken trunk ，the limb on he was standing cracked ominously under his feet.

With an appropriate relative pronoun or relative adverb:
So far we have not been able to fix the date we shall start the conference.

Nobody knew the reason（ ）she turned down his proposal.

I have no business relationship with any company（ ）stock is mentioned in this article.

Fill in the blank with an item as required.

​With an appropriate relative pronoun or relative adverb:

Beer is the most popular drink among male drinkers,  overall consumption is much higher than that of women.

（ ）they went, they managed to win over new fans through the warmth of their music.

With an appropriate relative pronoun or relative adverb:
Many American people are going to settle in North Carolina, land is cheap.

Fill in the blanks with an item as required. 

With a relative pronoun：

In the past，people had to take a ferryboat to Chongming Island，but now they can drive to it, is a great saving of time.

Fill in the blanks with an item as required.

​With a relative pronoun:

The employees of that company can choose their own jobs within their department,  we cannot.

Fill in the blanks with an item as required.

With a relative pronoun​:

Bob is a popular sports star in his college, his brother Jerry never is.

Fill in the blanks with an item as required.

With a relative pronoun:
Ultrasonic sounds produce pulse signals, by means ofvarious defects in metal can be detected.

Fill in the blanks with the appropriate words given in the group.  

seconds, minutes, years, which, that, what 

The traffic was held up for more than thirty , caused me to come late.

Alibaba has accomplished many milestones, a few of（ ）are highlighted below.

With an appropriate relative pronoun or relative adverb:
This custom,originated many centuries ago, is slowly disappearing.

With an appropriate relative pronoun or relative adverb:
Young migrant workers constitute the main labor force in the second industry,comprises mainly of manufacturing.

When I just moved to Canada, Chinatown was the place（ ）made me think of my home.

This is the house（）windows were broken.