People are starting to use new type of energy _______ the sun, wind and water.
A. in B. from C. by D. into
Do you have to say about your dog?
A. anything else B. other something
C. something else D. others anything
I haven't gone back to my hometown I left it in 1993.
A. when B. as C. till D. since
When the passengers’ (乘客) families heard the bad news, they were _____ to stay calm.
A. too sad B. sad enough C. enough sad D. so sad
Which of the following signs means ‘Don’t drop litter’?
—— It was great fun to be a volunteer, wasn't it?
—— Yes. That's experience hard to forget.
A. a； an B. /； an C. /； the D. a； the
