When do you think ______ start the new attack?

here has been a great increase in retail sales , ____ ﹖

In recent years much more emphasis has been put______ developing the students productive skills.

We hadn't met for 20 years, but I recognized her_____ I saw her.

The professor said he could talk on _____ interested the audience.

_____ of water makes Death Valley a desert, but it is by no means devoid.

George applied for the position three times ______ he finally got it.

During the tourist season, there are many people wandering in this city to see the old castles _____ in the sixteenth century.

We need a more capable leader, ______ with strong will and as well as good humour.

Modern science and technology has _____ communication between people far apart.