The safety of food has become one of the _________ problems in our daily life.
A. more expensive B. more important
C. most expensive D. most important
We are supposed to ___________a solution to stop people from looking down at their mobile phones while driving cars.
A. come up with B. come from
C. come out D. come true
The left-behind kids(留守儿童)can’t see their parents_________ the parents come back home from work.
A. but B. until C. or D. if
---- Excuse me, could you please tell me ________?
---- Yes, there is a history museum.
A. how often do you go to the history museum
B. are there any good museums in Kunming.
C. how long it takes to get to the history museum
D. if there are any good museums in Kunming.
Teenagers should be encouraged to go ______and be close to nature.
A. inside B. back C. outside D. off
----- Hey guys, Chinese way of _______the road is very dangerous. You must wait for the green lights on。
----- Thank you for your advice, sir.
A. going B. walking C. crossing D. passing
