---How much shall I pay for the phone call? ----You ____ .This is free of charge.
| A．shouldn’t | B．can’t | C．needn’t | D．mustn’t |
The doctor recommended that you swim after eating a large meal.
A wouldn't B couldn't C needn't D shouldn't
The good thing about children is that they _______ very easily to new environments.
| A．adapt | B．appeal | C．attach | D．apply |
It took ______ building supplies to construct these energy-saving houses. It took brains, too.
| A．other than | B．more than | C．rather than | D．less than |
Over the past decades, sea ice _____ in the Arctic as a result of global warming.
| A．had decreased | B．more than | C．attach | D．apply |
The medicine works more effectively ______ you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |