ourselves，gravity，without，nervous，diary，if，weak

（1）Many people feel

nervous

nervous

when they speak in public（公共场合）.
（2）We will not go to the park

if

if

it rains tomorrow.
（3）Without

gravity

gravity

，no one will be able to stay on the ground.
（4）We can only live for about a week

without

without

food.
（5）The little boy is very

weak

weak

.He cannot lift the light box up.
（6）What do you usually write in your

diary

diary

？
（7）We enjoyed

ourselves

ourselves

at the dancing party last night.