My headache kept getting worse, so I took an aspirin.

A. The plane could land as the fog was hardly thick.

B. The plane cannot land because the fog is thick.

C. It was possible for the plane to land although the fog was thick.

D. The plane was unable to land because of the thick fog.

A. The exam result might be announced next week.

B. The exam result will surely be announced next week.

C. We may receive very good exam result next week.

D. They are going to give US exam result next week.

A. We were lost, so we stopped to ask a policeman for direction.

B. We lost, so we stopped and ask a policeman for direction.

C. We are lost, so we stopped asking a policeman about direction.

D. We were lost, so we stopped to asking a policeman for direction.

A. When did you build this beautiful city?

B. How many beautiful cities did you built?

C. When was this beautiful city built?

D. How old were you when you built this city?