The company lost money in the past three years. However, the introduction of the new product line made a (　　) difference. Now they are earning a large profit.

To increase sales, the car dealer decided to offer a free service package with every purchase. Unfortunately, the plan was not as (　　) as the company had hoped.

A: Would you send me signed copies of the files for the ABC project?

B: When do you need them (　　)? I should have the documents ready this afternoon.

The doctor's clinic was not set up to handle complicated surgeries. Therefore, he decided to send the patient to a larger hospital that had the proper (　　).

Companies from Europe, China, and Japan (　　) rare metals in the Democratic Republic of the Congo that are indispensable for smartphones, laptops and hybrid cars.

There are over 100 species of birds and 250 types of plants native to that forest. The government decided to create a national park to protect the forest's (　　) natural resources.

Economists estimate that the country's oil (　　) will last for another 30 years. After that, another source of fuel will be needed.

The patient was unconscious for three days. Aware of the (　　) of the situation, the doctor decided to perform experimental surgery.

The company was going to introduce its new product last weekend. However, it decided to delay the (　　) because of last-minute changes to its advertising campaign.

The corporation is waiting for approval from the city to open a new factory at that site. The approval is the final (　　) to overcome before they can start building.

Only visitors with (　　) from the main office are allowed to enter this part of the building.

All new employees must work in a pair with an experienced technician for three months. After that training period, they can work without direct (　　).

The health department shut down the restaurant because of poor sanitation. It is not allowed to serve meals until it complies with all the city’s (　　).

A: Next year the sales tax is going to increase by two percent.

B: We should take (　　) the lower rate now and buy a new refrigerator.