— The problem is a bit difficult .
— ________ask your teacher for help?
A. Why not B. What about C. Try to D. You should
—Did you know that the earth is the home of animals?
A. million B. million of C. millions of D. millions
—Which country has________population ,China , India or America?
— China.
A. the least B. the largest C. the smallest D. the most
I bought a new sweater last weekend. It________me 120 yuan.
A. paid B. took C. cost D. spent
—You must look around when you go________the street.
A. cross B. past C. across D. On
—________does your father play table tennis? —Twice a week.
A. How long B.How often C. How soon D. How far
