หน้า 39.
1). How long has Yi Ling Tang worked for the electronics company? She's worked for the electronics company since February last year.
2). How long did she work for the airline company? She worked for the airline company for three years.
3). How long ... she....in Singapore?
4). How long ...they ... in eastern Singapore?
5). How long ... they ... downtown?
6). How long .... Yi Ling Tang's husband ..... at the Shangri-La Hotel?
7). How long ......he ...... his own restaurant?