My career as a teacher began 14 years ago.

A. Unless the homework is easy, I will ask you for help.

B. Unless the homework is difficult, I will ask you for help.

C. Unless the homework is easy, I won’t ask you for help.

D. Unless the homework isn’t difficult, I won’t ask you for help.

A. Complaints should be sent to the head office.

A. Bicycles must not be left in the hall.

B. Bicycles in the hall must not being left.

C. Bicycles in the hall must not left.

D. Bicycles must been not left in the hall.

A. He advised me against going.

B. He told me to stay with him.

C. He asked me not to go.

D. He advised me never to go.

A. I haven’t meet my aunt for long ago.

B. The last time I met my aunt was since years ago.

C. I last saw my aunt years ago.

D. I didn’t see my aunt years ago.

A. She asked me if I liked to stay for dinner.

B. She invited me to stay for dinner.

C. She offered me dinner.

D. She was very kind to offer me dinner.