Mrs.Weinsteinbravelyandpersistentlyusedeveryskillandpowershehadtoherattackertosimplytakehercarandnotherlife.

Thetheoryofblackholesinspace__(accept)bymanyseriousscientistsandastronomers.

在双缝干涉实验中，屏幕上P处是暗条纹，则两束相干光在P处的光程差可能是（）

I'dappreciateitverymuchifyoucouldmakesome________onmyrecentarticleattheconference.

Ifyouhavedifficultylocatingaparticularbook，pleaseaskourlibrariansfor___(assist).