21．—Tommy is planning to buy a car.
— I know .By next month ,he ____enough for a used one.
A．saves B．will have saved C．will save D．saved
22．We’d better discuss everything _______ before we work out the plan.
A．in detail B．in general C．on purpose D．on time
23．Between the two parts of the concert is an internal,______the audience can buy ice-cream.
A．which B．that C．when D．where
