I don't think the experiment is ___ failure, because it has provided us with ___valuable experience for our future tests.
19.So eager_________a chance to answer questions, little Tommy waved hard and high in class.
18._________a US visitor visa twice, the old couple finally gave up their hope of going to America to experience Thanksgiving Day.
17.If Tom finds a favourite song, he may want to hear it over and over again to the point_________everyone else is sick of it!
16.-Governments at all levels have to take measures to improve the quality of basic education. -Exactly. _________, students' homework must be greatly reduced.
15.A government, which is responsible for society, must_________to its people how important the method is to prevent AIDS.