________ he is ,he seldom shows his precious coins to others.
| A．Coin -collector as | B．As a coin -collector |
| C．A coin- collector as | D．Coin- collector that |
Unfortunately, the research was limited __________ increasing economic profits, _________ protecting the environment.
| A．to; other than | B．by; rather than | C．to; rather than | D．by; more than |
We have to realize: boys share activities, _________ girls share feelings.
| A．while | B．when | C．as | D．since |
---- Pity you missed the lecture on nuclear pollution.
---- I _________ it, but was busy preparing for a job interview.
| A．would have attended | B．had attended | C．would attend | D．attended |
The most important thing about my job is ______ I help protect ordinary people from the volcano.
| A．how | B．that | C．what | D．不填 |
Everyone here will thank the firefighter for the things they have done to prevent fires______ the environment safer.
| A．make | B．to making | C．to make | D．from making |