______ useful the information they've given to us is A what B what a C how the D how

The computer is ______ useful invention in the modern wored.A.a B.an C.the Lily always takes an ______(积极的)part in the useful activities. Here ______ some useful food for the party Dictionary is ______ useful tool.A an B a C / DDictionary is ______ useful tool.A anB aC /D the comuputers are the second most useful ______ in the world .A invention B inventions.请问,选哪一个?高手指教为盼.在此谢过! wood is one of ( )in our life A、useful materials B、more useful material C、the most usefulwood is one of ( )in our life A、useful materials B、more useful materialsC、the most useful materialsD、the most useful material The most useful invention in the modern life English is one of the useful languages in ____________ metings There is ()uand()sin the word useful. the rule is useful once in a blue there is some useful information in the book分析句子成分 This is ______ useful book. A. a B. an C. the D/This is ______ useful book.A. a B. an C. the D/要解释 Don't _____(worry)about yourself .2.l think English is ______(useful)among all the languages.3.The member of the people in china ____(be)/____ ____(reach) “This is ______ most useful reference book,” a teacher from ______ European country told us in cla a ______(Dog)dog is ______ useful animal. You will find the information useful(同义句)You will find ____the information _______ ______ “The book ______ (提供)me a lot of useful knowledge.”这道填空题怎么答? Trees are useful to man mainly in three ways,the most important of which is that they接can protect ______ from droughts (干旱) and floods.A.it B.itself C.himself D.him答案为什么是D