My boss is waiting for the report， so I can't leave here _______I finish it．（ ）
| A． |
since |
B． |
until |
C． |
though |
D． |
if |
While the lights to red， a car suddenly appeared round the corner（ ）
| A． |
change |
B． |
have changed |
| C． |
were changing |
D． |
will change |
The government is setting up nature parks protect pandas．（ ）
| A． |
to help |
B． |
help |
C． |
helped |
D． |
helps |
The Hong Kong﹣Zhuhai﹣Macao Bridge in 2018． We are proud of it．（ ）
| A． |
is completed |
B． |
is completing |
| C． |
was completed |
D． |
completes |
﹣﹣﹣What is your plan for next weekend， Lingling？
﹣﹣﹣I volunteer work in the museum．（ ）
| A． |
was doing |
B． |
did |
| C． |
have done |
D． |
am going to do |
You walk on the wet hill path because you fall and hurt yourself．（ ）
| A． |
must； might not |
B． |
mustn't； might |
| C． |
needn't； need |
D． |
must； must |