单项选择题
By lip reading or watching the movements of the speaker’s lips，a deaf person can actually see ______ the person is saying.
单项选择题 When we have difficulty ______ obtaining desired objects or reaching desired goals we experience negative emotions such as grief and anger.
单项选择题 On the giant plane there are ______ the jet needs.
单项选择题 The Olympic Games______ held ______ four years.
