2. The boy wanted to ride his bicycle in the street, but his mother told him _____.

A. not to              B. couldn’t          C. not do it            D. do not to

3. The flowers his friend gave him will die unless______ every day.

A. watered           B. watering          C. water              D. to water

4. Zhuhou, _______ on the Xiang River, is an important city, second only to Changsha.

A. located            B. locating             C. being located   D. to be located