They have vowed to protect the country's territorial ______ which is one of the bases for the country to develop relationships with other countries.

单项选择题The school ______ a public debate on whether they should build a new computer laboratory or not.

单项选择题Many proverbs ______ in ancient Greece and Rome and in medieval Europe, spreading from country to country in Latin texts.

单项选择题Now that we have succeeded in isolating this drug, our next problem is to plan its in the laboratory.

单项选择题The President has again ______ with Congress over his budget plans.

单项选择题One reason for the success of Asian immigrants in the U.S. is that they have taken great ______ to educate their children.

单项选择题Key resources are technical personnel and aircraft spare parts which account for the largest share of the maintenance ______.

单项选择题Material choices such as timber and steel also help to keep the house cool, while light colours have been used on the exterior surfaces to ______ heat and blend in with the surrounds.

单项选择题A pair of night birds circled above, the ______ of their wings and their weird screams penetrating the thickening mist.

单项选择题The ______ among his sisters was that he ought to marry the girl as soon as possible to avoid a scandal.

单项选择题It is unlikely that enough qualified teachers will be found unless there is ______ improvement in salaries and conditions of housing.