Although we had been out of touch for ten years, I recognized her _____ I met her.

It is written clearly in the requirements that all passengers _______ check onto board thirty minutes before the plane takes off.

Where is Mr. Wang – He together with his students ________ Zhuyuwan Park.

You can’t complain about being left out ______you don’t make any effort to share your joys and sorrows with others.

It is about ten years _____ I met you last.