At last，we found ourselves in a pleasant park ________trees providing shade(荫凉)and sat down to eat our picnic lunch．
A．for B．from C．of D．D. with
We forbid ______ in the lecture hall, so you are forbidden _____ here
| A．to smoke; to smoke | B．to smoke; smoking | C．smoking; smoking | D．smoking; to smoke |
The manager along with his workers _______ day and night to complete the project.
| A．have worked | B．work | C．is working | D．are working |
After a short ________, I got my bag from the thief’s hand successfully.
| A．exchange | B．explanation | C．encouragement | D．Struggle |
The most important thing ______ we should consider is the first idea _____ he has mentioned in the speech.
| A．which; that | B．that; which | C．which; which | D．that; that |
He was so pleased with all _____ we had done for him _____ he wrote us a letter to praise us for it.
| A．that; that | B．what; that | C．that; what | D．what; what |