（题文）There is a blackboard________ our classroom. Our teacher was standing ________ the blackboard at this time yesterday.
A. in front of; in the front of B. in the front of; on
C. in the front of; in front of D. in front of; in
When the man downstairs knocked at the door, I_______.
A. am doing housework B. was doing housework
C. were doing housework D. am going to do housework
— _________ beautiful park Xiaoyaojin Park is!
A. What B. What a C. How D. How a
The rainstorm came while Ann ________ her purse in the classroom.
A. was looking for B. looked for C. is looking at D. looks at
（题文）All the students were sleeping _______they heard a man _______“help”.
A. when; shouting B. while; to shout
C. when; to shout D. while; shouted
My father was reading a newspaper while my mother ______ dinner.
A. is cooking B. cooks
C. was cooking D. will cook
