1、An all-round,balanced and effective reform of the international system is____must in preventing——future financial crisis.
A.the the B.a the C.a a D.the a
2、A: How did you do in your essay?
B: I got ——okay grade, but Mr Jones gave Sarah Evans top marks .She’s ——teacher’s pet, you know.
A./ a B.the / C.the a D.an a
3、——teacher of my grandfather‘s will come tomorrow.I’m wondering how old——man he should be.
A.the a B.A a C.A the D.The the
4、I have finished——health-care course and learned many tips on——good health.
A./ / B.the the C.a / D.a a
答案给得都差不多，一说这个是泛指，就出答案了，我咋看不出特指泛指了...
求解析！
解析？