It was 1920 ______ regular radio broadcasts began.
| A．while | B．when | C．that | D．since |
His great contributionsthe development of a modern China will never be forgotten.
| A．by | B．to | C．for | D．with |
He isvery man to whom you can turn forwhen you have difficulty.
| A．the; help | B．the; the help | C．a; a help | D．/; help |
The book is said to the special one,many events not found in other history books.
| A．it writes | B．which covers | C．it prints | D．which reads |
Don’t worry about her; she will realize what you said is for her good
| A．sooner or later | B．sooner and later |
| C．soon or late | D．soon and late |
If the bottle of gasfire, the whole building may
| A．will catch, be burned to the ground | B．catches; be burned down |
| C．is on, burn down | D．will be on; be burned down |