It was not until 1938 _________ the first colour TVprogramme was broadcast.

We all like teachers ________ a lot of knowledge.

Some modem paintings are _____ my understanding; I simply can’t understand what the painters really want to tell us.

What are you reading there,Susan— Nothing interesting. I am just ________the pages to kill time.

I went to the Lincoln Memorial yesterday, _____, not surprisingly, was crowded with visitors from all over the world.