What's the difference between a monkey and a flea( 跳蚤 )
What is black when it is clean and white when it is dirty
What 5-letter word has six left when you take 2 letters away
What is the center of gravity
The letter V
A monkey can have fleas, but a flea can't have monkeys
A blackboard
a robotic doga solar energy carLife in the futurehealtheducationtransportation housefoodclothessportsartsculturebusinessBrainstormWhat life in the future will be like
livecommunicateVideo phoneVideo chat onlineshoppingOnline shoppingmallSmart cardsSchool on the airtravel1
In the past , there ______no trees left in or around the village
were D
have been 2
What ________in the past few years
changed B
had changed C
has changed D
have changed 3
A lot of work_