1. Being a volunteer is great!
[考例] ________ on real ice is very exciting.
A. Skate   B. Skates
C. Skated   D. Skating
[解析]D。这里是动词短语作主语表示抽象意义,动词须用v-ing形式。
2. He spends every Saturday morning working in an animal hospital.
[考例]Jim spent three years ________ Chinese before he came to China.
A. learned  B. to learn C. learning
[解析]C。spend ... (in) doing sth.是固定结构,意为“花费(时间、金钱)做某事”。
3. “Don’t put it off,” says Huiping.
[考例]We have_________ our sports meeting till next Monday because of the bad weather.
A. put on  B. put off  C. put down
[解析]B。put on意为“穿、戴”;put off意为“推迟”;put down意为“放下”。只有put off符合题意。
4. Last week everyone was trying to cheer up Jimmy, the Bike Boy.
[考例]Although Jeff loves KFC, he tries _________ it too often.

A. to eat   B. not eat