Did he write all the articles _________ or did anyone help him?[ ]

Have you got any friends in China?—________．Daming and Lingling are my good friends．

The child tiptoed quietly to the bird, _____ into the forest when he was about to catch it.

has Bob been collecting stamps? — Since he was 8 years old. [ ]

Don’t forget to brush your _________／ti: θ／before you go to bed.