It was because I like you ______ I speak out frankly.

It was in the remote mountain areas        I spent the gap year        I learned how to work with a group of strangers and how to look after myself.

.It was in the 1990s _______ we were working together ____ we made friends with each other.

— How long is it _____ you picked up your badminton training? — It was not until my finance became better in last December _____ I started the training.

It is only with the help of scientific research _____ bring PM1 air pollution under control.