The protection of our environment is not _______ to be left to the government. Everyone should be concerned.
--- Sorry for the delay.I got lost in the mountain. --- OK.You’re safe and that’s what .
There came a point in his life ______ he had to think seriously about his future.
a bad habit is formed, it will take a long time to get rid of it.
Li Gang was required to apologizethe people present at the meeting __ what he had done.
--- Hi, Lucy.Do you know where Linda is? --- She in the library.I saw her there just a few minutes ago.