I didn't see you ____ in． You must have been very quiet．（ ）
A．comesB．to comeC．comeD．have come
During the Spring Festival， the young a kowtow（磕头） to the elders， but now they only give them best wishes．（ ）
A．used to giveB．were used to give
C．were used to giving
When you visit a foreign country， it is important to know how to ask for help ．（ ）
A．latelyB．widelyC．politely
I really want to pass the exam for further study．
Believe in yourself， dear! Your dream will came true you put your heart into it．（ ）
A．even ifB．as long asC．as soon as
The Boeing 737of Cuba airline crashed （坠毁） in Havana on May 18， 2018， which ________more than 100deaths．（ ）
A．causedB．influencedC．forced
Tibet receives foreign visitors from January to April each year．（ ）
A．thousand ofB．thousands of
C．several thousands