--- How much do I owe you for dinner?
--- . It’s nothing.
| A．You’re welcome | B．Forget it. |
| C．With pleasure | D．That’s right |
Experiments of this kind ___in both the U．S and Europe well before the Second World War．
| A．had conducted | B．have conducted |
| C．have been conducted | D． had been conducted |
The situation forced my mother and I exchanged our roles as child and caretaker, making me grow up much faster than the _____ child.
| A．average | B．ordinary | C．common | D．usual |
It is the first time that he ______ here and now it is high time that he ______ around.
| A．come; should be shown | B．has come; was shown |
| C．came; was shown | D．has come; be shown |
—Dad, dad! My head hurts so much. I think I’m dying.
—________, darling! The doctor says you will feel better soon.
| A．That will do | B．There, there | C．Hi, there | D．So long |
Joan stood outside a shopping mall for a long time, as if ________ somebody.
| A．to wait for | B．waiting for | C．waited for | D．having waited for |