More and more people like to talk with their friends ______ sending messages on WECHAT(微信)
When his mother came into his room, he pretended ______
Would you mind __ me how ___ the chemistry problem?
He is so careless that he often_______his school things at home.
--- Was Tom a member of Greener China? ---Yes, he has ___ Greener China for 5 years.
The room was very dark, so I couldn’t see anything ______