____ his way to school, he picked up a wallet and found the owner ____ a rainy day.
You________such clothes because you are still a student.
Lots of trees ________in our city over the years. It is becoming greener and greener!
-Hey, Molly, You______ on the phone just now. But you weren’t here and the man left a phone number.-Oh? I was in the library.
The little boy was made _____ again after his mother told him some jokes.
— Food problem is becoming a big one in China!—I think the food ________ before going to shops or supermarkets.