We’d be very grateful if you could join us because your cooperation will________the timely completion of our project.

Not until recently _______ paid work outside the home.

orry I didn’t go to the cinema with you yesterday. You know, I _____ the film.

The OPEC has recently cut backproduction and the price of oil has been ______ to $90 a barrel .

_____, I practice speaking English in the park. The air there is very fresh.