I was watching TV ___ _ the thief came into the house.
A. when B. while
C. for D. because
Look! The boy is sitting ___ _ a tree.
A. on B. in C. of D. above
— ___ _ you reading at this time yesterday? — No, I was ___ _ .
A. Were; singing B. Are; watching TV
C. Were; put off D. Are; having a rest
The number 6,743,234,123 is read ___ _ .
A. Six billion, seven hundred and forty-three million, two hundred and thirty- four thousand, one hundred and twenty-three
B. Six billion and seven hundred and forty-three million and two hundred and thirty four thousand and one hundred twenty-three
C. Six billion and seven hundred and forty-three million and two hundred and thirty four thousand and a hundred and twenty-three
D. Six billions, seven hundreds and forty-three millions , two hundreds and thirty -four thousands a hundred and twenty-three
I ___ _ my clothes when my father got home.
A. wash B. washed
C. am washing D. was washing
We should protect the earth because it's home to ___ _ animals.
A. million B. millions
C. million of D. millions of
