_______ many times, he finally understood it．
| A．Taught | B．Teaching | C．Having taught | D．Having been taught |
— You’ll have to use the stairs. I’m sure the lift is out of _______.
— Is it under repair?
— Yes.
| A．control | B．use | C．work | D．order |
The result was far beyond we had expected, brought great joy to every one of us.
| A．that; which | B．than; that | C．what; what | D．what; which |
It is the America’s selling weapons to Taiwan cast a shadow on the Sino—US relationship.
| A．what | B．which | C．that | D．where |
The ground has been cleared and houses for those homeless people now.
| A．build | B．have built | C．are built | D．are being built |
serious the economic situation is, they still have confidence in overcoming all the difficulties.
| A．Whatever | B．Although | C．Even though | D．However |