It was because of the bad weather _________ the football match had to be put off.

—Whom did she try to avoid meeting?—________ was a certain boy with the intention of marrying her.

It was in the lab_________was taken charge of by Johnson_________they did the experiment.

It was with great joy_____ he recieved the news ______ his lost daughter had been found.

 It was not until this year _____ scientists managed to make a cat and a goldfish disappear from sight using an invisibility cloak(斗篷)