Though this kind of _______ has some _______, it is good enough for construction(建筑).

I didn’t know it could do terrible ______to your heart and lungs or ______was more difficult for smoking couples to become pregnant.

Most senior high school students are working hard day and night to pass the college entrance examination, gaining ______ to a university.

We all know that our teachers have different _______of teaching

He glances briefly towards her but there is no sign of ________. After all, it’s 15 years since they last met.