单项选择题
If reading is to accomplish anything more than ______ time, it must be active.
单项选择题 When Pilot Office Peter Thwaites was away on business, his neighbou gave his wife ______ with the housework.
单项选择题 Our school singing group is going to give ______ performance next month; don't miss it.
单项选择题 In vain ______ to get in touch with the Embassy.
