单句语法填空
1．___________ (advocate) by many wellknown experts and film stars, the product was very popular at one time.
答案：Advocated
2．Most of the students interviewed last week opposed ___________ (have) classes on Sunday.
答案：having
3．Quantities of money ___________ (spend) in bringing up the children since they were married.
答案：have been spent
4．There are a variety of animals ___________ (range) from rabbits to tigers in the park, including a rare species of monkey.
答案：ranging
