We can't cross the road ______ the traffic lights turn green．（ ）
| A． |
until |
B． |
if |
C． |
while |
D． |
as |
﹣Don't worry， Mom． The doctor said it was only the flu．
﹣_____I'll tell Dad there's nothing serious．（ ）
| A． |
What a relief! |
| B． |
Congratulations! |
| C． |
What for？ |
| D． |
I'm sorry to hear that． |
It's not easy to change habits，_____ with strong will and self﹣control， it is possible．（ ）
| A． |
for |
B． |
or |
C． |
but |
D． |
so |
Earth Day____in 1970 for the first time， and the Day now includes events in more than 190 countries and regions （地区）．（ ）
| A． |
celebrated |
B． |
was celebrated |
| C． |
is celebrated |
D． |
has been celebrated |
Livestreaming （直播）___a new chance for traditional culture artists．（ ）
| A． |
practices |
B． |
provides |
C． |
promises |
D． |
protects |
Sophia waited for a reply， but____came．（ ）
| A． |
either |
B． |
another |
C． |
neither |
D． |
none |