Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

This book is divided for 12 units, each of which consists of 3 chapters.

A. He tried his best to win the gold medal in the swimming competition.

B. His determination was paid off by winning the gold medal in the swimming competition.

C. He managed to win the gold medal in the swimming competition.

D. The gold medal was his present for his efforts.

A. best     

B. visiting team     

C. to     

D. scoring

A. If he wasn’t careless, the accident wouldn’t happen.

B. His carelessness was responsible for the accident.

C. He was the ones who caused the accident.

D. Thanks to his carelessness, the accident happened.

A. tries     

B. to become     

C. of     

D. when

A. It is very difficult to complete the assignment.

B. No one in the class can’t complete the assignment.

C. The assignment is easy enough to complete.

D. It is a pity for him not to complete the assignment.

A. At school, he and his friends often play soccer in the school yard.

B. After school, he and his friends often play soccer in the school yard.

C. After school, he and his friends often plays soccer in the school yard

D. On school, he and his friends often play soccer at the school yard

A. He didn’t leave the room when Mary came.

B. He still waited for Mary when she came.

C. No sooner had he left the room than Mary came.

D. It was impossible for him to leave the room when Mary came.