I listened to Professor Chen-Ning Franklin Yang’s lecture about his study and physics, but I failed to get its key ______ .

The suspect who was caught this morning is murder and he has also been guilty of several crimes before.

Is this your pen Please call me _____ 0833-8817171.

Though a typhoon is on the way，people are still looking forward _____ the outdoor concert．

We thought it was a story and we all got .