A_____is a person who is in someone's home by invitation，for a short time，as for a meal，or to stay one or more nights．（ ）
| A． |
boss |
B． |
customer |
C． |
guest |
What do you think of the fish soup？
Well， it ______ a bit salty．（ ）
| A． |
looks |
B． |
smells |
C． |
tastes |
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 |