After a short rest, the workers kept on _____ till midnight.
A. work B. working
C. to work D. to working
___of giant pandas is getting ___because their living areas are becoming farmland.
A. The number, larger and larger
B. A number, larger and larger
C. The number, smaller and smaller
D. A number, smaller and smaller
My parents told me _____ at the old people, it’s impolite.
A. to laugh B. laughing
C. laugh D. not to laugh
You’d better_____ like that, or the teacher will be angry .
A. do B. doing C. not do D. not doing
He looked ___________,but could see ____________.
A.careful; nothing B.carefully; nothing
C.careful; anything D.carefully;anything
I was doing my homework ________ my mother was cooking in the kitchen.
A. when B. while C. if D. until
