Had it been possible I would have gone to the movies but I________ busy[ ]

The experiment is of particular importance.　　　　—I see. We will carry on with it ________ we can get enough money.

If a peace process got under way, Saudi Arabia would_______ directly in talks about such problems of regional concern as shipping and pollution.

Light blue isthe best colour me.

Your trousers____ dirty.You must have____washed.