I remembered ________ the door before I left the office, but forgot to turn off the lights.
—Why are you crying? Today is your birthday!—_______. I am so excited with so many friends surrounding me.
--- Haven’t seen you for ages! Where have you been ?--- I went to Ningxia and _______ there for one year, teaching as a volunteer.
When _________ our national flag _______, we feel our hearts full of pride and strength.
Since the time humankind started gardening, we _ _ to make our environment more beautiful.
All the books donated by the students from urban schools are said ________ to the students in the earthquake-stricken areas the other day.