The land is rain because it hasn't rained for several months．（ ）
| A． |
known for |
B． |
useful to |
| C． |
harmful to |
D． |
thirsty for |
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 |
Corn production____nearly 125 percent over the past 25 years in China．（ ）
| A． |
jumped |
B． |
jumps |
C． |
will jump |
D． |
has jumped |
She says that she'll have to close the restaurant____business improves．（ ）
| A． |
if |
B． |
after |
C． |
unless |
D． |
when |