This design is ________ satisfactory.So you’ll have to try your best to better it.
The scientists are able to ____________ accurately when the spaceship will reach the moon.
-Can I pay the bill by check?-Sorry, sir. But it is the management rule of our hotel that payment ______ be made in cash.
The driver got out of the car_______it caught fire.
__________twice a year, whether it is a car or bus or a truck, is the rule that every driver must obey in this city.
Peter was fired again. He really didn’t know _____ went wrong.