The spaceship has already (着陆,降落) on the moon.
The stamp I bought yesterday (花费)me 20 yuan.
It's a good habit to brush your (牙齿) after a meal.
People often fly kites on sunny and (多风)days.
污染如此严重,人人都应该出一份力来制止它.( so…that )
我记得在七年级时见过你们所有的人.( remember doing )