He studies hard all the time，_______ he has made rapid progress in many ways．（ ）
| A． |
so |
B． |
because |
C． |
but |
D． |
yet |
Tom，I wonder________．
In Beijing， the first city to host both summer and winter Olympics．（ ）
| A． |
where will the 24th Winter Olympics be held |
| B． |
where the 24th Winter Olympics will hold |
| C． |
where the 24th Winter Olympics will be held |
________has she been in Beijing？
Since five years ago．（ ）
| A． |
How far |
B． |
How soon |
C． |
How long |
Facial recognition（人脸识别）technology is widely used for payment． ________， we needn't enter the passwords any more．（ ）
| A． |
For example |
| B． |
As a result |
| C． |
What's more |
Gina used to live in the countryside with her parents， but now she is used to ________with her classmates at school．（ ）
| A． |
live |
B． |
living |
C． |
lived |
Do you know that we have already made great progress in 5G？
Oh， ________exciting news!（ ）
| A． |
how |
B． |
what an |
C． |
what |