单选题 Economists say that talent ______ is growing constraints on the country’s economic expansion.

单选题 It is obvious that he does not understand the true ________ of starting a business.

单选题 He was ________ to the headquarters in Seattle and has worked there ever since.

单选题 How would you motivate yourself when you have already ________ fame and made enough money to spend in your lifetime?

单选题 Do you realize how much damage and _________ the chemical factory is causing to people’s health?

单选题 The Web provides a ________ opportunity for innovation and interaction.

单选题 Despite the severe ________ in the international economy, standards of living did not show corresponding steep falls.

单选题 The business model is believed to have come into _______ about 100 years ago.

单选题 Only ________ effort enables one to fully grasp the implications of such a position.