David wants to be _______ engineer while Cathy wants to be _______ doctor.
Comparison may make something appear more beautiful than it is when _____ alone.
—What do you do, Rita?—I’m a clerk in a foreign company now.But I _____ English in a high school for 10 years.
—How are you getting along with your German, Kate?—Oh, Mr.Black, I’m so tired of it.Maybe I should drop out _____ it kills me.
A public health campaign _____ the number of heart disease deaths by 80 percent over the past three decades.
If it _____ earlier, the printing machine would not have broken down.