Mackenzie wrote four best-sellers before he was twenty. By the age of twenty ________

A. The doctor advised Kate no smoking.

B. The doctor advised Kate not smoke.

A. Although she was tired, but she stayed up to watch the late night film on TV.

B. Although she was tired, she stayed up to watch the late night film on TV.

A. Nobody at the meeting say that to the press.

B. Nobody say anything to the press.

A. eldest

B. oldest

A. If only I was there with you yesterday.

B. If only I have been there with you yesterday.

A. Thank to your help, I could find/ have found my relatives

B. Thanks to you help, I would find my relatives.

A. The novel was believed to be written by a young writer.

B. The novel was believed written by a young writer.