Are you good at ______?A. swim B. swimming C. to swim
-The Greens are not here. If you need help, you should __________.-Sure.
-My little brother was really_______ at the _______ news.
-The flight to Beijing will _________ in one hour.
-__________ will you finish your homework, Ben?- In two hours.
We should try our best to help the animals _______.