1．If he wants to go to Hong Kong tonight, he has no alternative but __________ (go) by air.
[答案] to go
2．The boss commanded that his workers __________ (not leave) their office before dark.
[答案] (should) not leave
3．The man they arrested last night was charged __________ murder.
[答案] with
4． It has changed who we are and continues to fuel our __________ (optimistic)．
[答案] optimism
5． I had a learning __________ (disable) from an early age.
[答案] disability
6．Teens and young adults may feel forced to use drugs, or join gangs that encourage __________ (crime) behavior.
[答案] criminal
7．In a year he collected __________ (rely) information on 1,600 shoes.
[答案] reliable
8．It's an investment that is very __________ (risk) but could yield great profits.
[答案] risky
