What were you doing ______ I knocked at the door？
I was sleeping．（ ）
A．unlessB．onceC．whenD．while
______ do you spend on Wechat every day， Lily？
About one and a half hours．（ ）
| A． |
How long |
B． |
How much |
C． |
How soon |
The program I'm a singer is quite popular ______ students these days． They often talk about it between classes．（ ）
| A． |
for |
B． |
with |
C． |
in |
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 |