Mark the letter A, B, C or D on your answer sheet to indicate the underline part that needs correction in each of the following questions.

The actor and singer were singing on the stage when we arrived at the theater.

A. after your profile will be available online

B. when you finished your online profile

C. as soon as you completed your online profile

A. engagement

A. Hadn't the government acted late, the general public wouldn't have been worried so much about the current situation.

B. Were the government to act promptly, the general public wouldn't have been worried so much about the current situation.

C. Had the government acted sooner, the general public wouldn't have been worried so much about the current situation.

D. But for the prompt action of the government, the general public wouldn't have been worried so much about the current situation.

A. bookshelf

A. The other stamps in my collection are more common than this one.

B. The others stamps in my collection are more common than this one.

C. This stamp is as rare as any other in my collection.

D. The other stamp is much rarer than this stamp.

A. although

A. a