His writing is so confusing that it’s difficult to make out _______ it is that he is trying to express.
A. that B. how C. what D. who
Whatever is left over may be put into the refrigerator, _____ it will keep for two or three weeks.
A. when B. which C. where D. while
If parents have children help with housework, the children will feel needed. , they will learn to take care of themselves.
A. On the contrary B. What’s more
C. That is to say D. In a word
I made a promise to myself _______ this year, my first year in high school, would be different.
A. whether B. what C. that D. how
Nothing is so easy as _____ parents to raise their expectations of their children too high.
A. of B. to C. by D. for
The air quality in the city, ______ is shown in the report, has improved over the past two months.
A. that B. it C. as D. what
