Mary got the first prize in the writing competition after years of hard work．
_________．（ ）
A．No pain， no gain
B．A miss is as good as a mile
C．Don't burn the candle at both ends
D．A friend in need is a friend indeed
Thank you for telling me so much knowledge about nature．
Don't mention it． ______ you have more questions， come to me any time．（ ）
| A． |
If |
B． |
Because |
C． |
Though |
There is someone knocking at the door．
It must be the repairman． I ______ him to come to fix our fridge two hours ago．（ ）
| A． |
call |
| B． |
have called |
| C． |
called |
______ exciting the news is! Beijing will hold 2022Winter Olympic Games．（ ）
| A． |
How |
B． |
What a |
C． |
What |
Julia， your mobile phone is ringing．
Wait a minute． It's dangerous ______ it while crossing the street．（ ）
| A． |
answering |
B． |
answer |
C． |
to answer |
Look， what an old bridge! It looks so special!
Yeah， it ______ nearly 500 years ago．（ ）
| A． |
was building |
| B． |
was built |
| C． |
has built |