While watching television, __________.
| A．the doorbell rang | B．the doorbell rings |
| C．they heard the doorbell rings | D．they heard the doorbell ring |
All her time _______ experiments, she has no time for films.
| A．devoted to do | B．devoted to doing |
| C．devoting to doing | D．is devoted to doing |
While shopping, people sometimes can’t help _____ into buying something they don’t really need.
| A．to persuade | B．persuading |
| C．being persuaded | D．be persuaded |
She can’t help ____ the house because she’s busy making a cake.
A cleaningB. to clean
C. cleanedD. being cleaned
He knows nothing about it, so he can’t help _______ any of your work.
| A．doing | B．to do |
| C．being doing | D．to be done |
Before going abroad he devoted all he could _______ his oral English.
| A．improve | B．to improve |
| C．improving | D．to improving |