The Boeing 737of Cuba airline crashed （坠毁） in Havana on May 18， 2018， which ________more than 100deaths．（ ）
A．causedB．influencedC．forced
After﹣school activities help students gain more skills and teach_____to care about others．（ ）
| A． |
me |
B． |
you |
C． |
them |
"Krystal， do you know how tea is produced？"
"Yes． When tea leaves are ready， they are picked by hand and then_____for processing．"（ ）
| A． |
send |
B． |
are sent |
C． |
were sent |
In difficult times， there are always national heroes_____step up and bring people hope．（ ）
| A． |
whom |
B． |
which |
C． |
who |
Even if we learn something well， we will forget it_____we use it．（ ）
| A． |
while |
B． |
until |
C． |
unless |
With the improvement in transportation， students in some small villages no longer go on ropeways_______rivers to schools．（ ）
| A． |
to cross |
B． |
crossing |
C． |
crossed |