We should consider the students’ request________ the school library should provide more books on popular science.
A. that B. when C. which D. where
He was heard________ three songs in the next room.
A. sing B. to sing C. singing D. sung
-Young man, come off the grass; we forbid________ on the grass here.
-Sorry, I didn’t notice it.
A. to stepping B. stepping C. why D. which
Christina wasn’t saying anything, but the professor smiled at her _______she had done something very clever.
A. as if B. now that C. while D. though
No matter what I do, my efforts ________always end in failure.
A. lose weight B. to lose weight C. losing weight D. lost weight
The factory used 65 percent of the raw materials, the rest of which _____ saved for other purposes.
A. is B. are C. was D. were
