_________ for his good skill,this doctor has a lot of visitors calling for help all the time.
| A．Knowing | B．To know |
| C．Known | D．To have known |
Little children ask endless questions because they are ______ about everything.
| A．skeptical | B．aware |
| C．capable | D．curious |
--Jack fell off the ladder yesterday, but he is all right now.
--What a lucky dog! He ______ himself badly.
| A．should injure | B． could have injured |
| C．should have injured | D．might injure |
The writer conveyed a positive attitude through his works.______, his readers are motivated and are themselves becoming a source of motivation for others.
| A．On the whole | B．In the meanwhile |
| C．In the way | D．On the contrary |
You are to meet with frustration in the pursuit of success and through greater effort and hard work your dream will definitely come true. Put it ______ , “No pains, no gains.”
| A．frequently | B．firmly |
| C．openly | D．simply |
The electronic red-packet has been so ______ that AliPay and Tencent Wechat compete against each other openly and secretly since the beginning of this year.
| A．popular | B．convenient |
| C．favorable | D．arbitrary |