Hearing the bell ringing，out ________.
| A．rushing the children |
| B．were rushing the children |
| C．rushed the children |
| D．the children rushed |
—I’ll call you at 9 tomorrow morning, OK?
—You’d better not, I ______ the piano then.
A. will be practicing B. am about to practice
am practicing D. practiced
Many people expect that credit cards will eventually______ paper money for almost every purchase.
A. trade B. replace 
exchange D. reduce
A person ________ email account is full won’t be able to send or receive any emails.
A. who B. whom
whose D. whoever
Global warming causes the ocean ________, which in turn speeds ice melting.
A. to warm B. warming
warmed D. warm
— I’m leaving now.
— ________ sure you turn off the switch.
A. To make B. Make
Made D. Making