The government of the United States began at once to investigate the case ______ a lot of students were killed.
—Guess what! I came across an old friend at the party last night. —______. I’m sure you had a wonderful time.
At the evening party the host said ______ was able to solve the riddle could get a nice present as a reward.
Hardly ______ to the airport ______ he was surrounded by many journalists and fans.
Thanks to the measures ______ by the local government , the polluted river is becoming clearer and clearer and fish have begun to show up in it.
The boys are still playing basketball happily on the court ______ it is raining heavily.