She didn’t know__________she could express her ideas clearly when she was invited to speak at the meeting.
| A．what | B．why | C．how | D．whether |
Whales are living ___________.
A. in sea B. in the sea C. on the land
Camels can walk a long way without __________ .
A. to drink B. drinks C. drinking
Stop _______ . It’s time for class.
A. talk B. to talk C. talking
you had better finish _______ your homework.
A. do B. doing C. to do
What about ________ a cup of tea?
A. have B. having C. to have