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

Science research helps us to discover many hidden secrets of the world.

A. His car was had to repair by the garage.

B. My father got the garage repair his car.

C. My father had his car repaired by the garage.

D. His car was repaired by the garage.

A. Most sand dunes may be over 200 meters in height.

B. Most sand dunes may be over 200 meters with height.

C. Most of sand dunes may be over 200 meters on height.

D. Most of the sand dunes may be over 200 meters at height.

A. We decided to go for a picnic because it was cold.

B. However cold it was, we decided to go for a picnic.

C. Cold as it was, we decided to go for a picnic.

D. If it wasn’t cold, we decided to go for a picnic.

A. look at     

B. see     

C. desert     

D. next of

A. often are     

B. used     

C by     

D. across

A. A student should concentrate to the lessons on class.

B. A student needs to be hard-working on class.

C. You mustn’t be lazy on class.

D. A student needs to take notice of the lessons on class.