accident　operation　whisper　midnight lap　lip　assist　first aid　in memory of　bite

（1）He didn't fall asleep until

midnight

midnight

.
（2）She bit her

lip（s）

lip（s）

to keep from crying.
（3）The little girl sat on her mother's

lap（s）

lap（s）

.
（4）His left knee was hurt in a traffic

accident

accident

.
（5）She

whispered

whispered

to me so no one else could hear.
（6）The temple was built

in memory of

in memory of

one of our ancestors.
（7）The nurse assisted the doctor in performing the

operation

operation

.
（8）Having a knowledge of

first aid

first aid

sometimes can save lives.
（9）Most European spiders don't

bite

bite

.
（10）We will do all we could to

assist

assist

the people in the flood-hit areas.