—Who has broken the window in my room?
—Who else it but your naughty son!
| A．could do | B．could have done | C．might do | D．must have done |
Great changes ______ in China in the past 20 years.
| A．took place | B．have taken place | C．were taken place | D．have been taken place |
I’m sorry to say that our food is almost _______.We can’t survive if there is no one to help us.
| A．by the end | B．at the end | C．in the end | D．at an end |
When the baby was crying, she started singing to him and was ________ with a smile.
| A．rewarded | B．awarded | C．prized | D．valued |
Only _______ people can have a good understanding of the lecture given by the scientist.
| A．devoted | B．generous | C．educated | D．reliable |
As is known to all language learners, the newly learnt words will soon be forgotten unless they are _______ used in everyday communication.
| A．gradually | B．sincerely | C．hopefully | D．frequently |