Hong Kong is __ the south of China， it's one of the busiest cities in the word．（ ）
| A． |
in |
B． |
on |
C． |
at |
D． |
to |
The Hong Kong﹣Zhuhai﹣Macau Bridge， the world's ______crosss﹣sea bridge， won another international prize in December， 2018．（ ）
| A． |
long |
B． |
longer |
| C． |
longest |
D． |
the longest |
Miss Chen， my dear English teacher， often encourages me ______the challenges in my study．（ ）
| A． |
face |
B． |
faces |
C． |
facing |
D． |
to face |
These machines_____in their factory by themselves last year．（ ）
| A． |
make |
B． |
made |
C． |
are made |
D． |
were made |
Listen! The birds ______ in the trees outside our school．（ ）
| A． |
sing |
B． |
are singing |
| C． |
sang |
D． |
were singing |
Lisa made so many mistakes in her homework， because she didn't do it ______enough．（ ）
| A． |
carefully |
B． |
busily |
C． |
quickly |
D． |
warmly |