Tom usually________to school early but his sister doesn’t.
A.go B.goes C.went D.will go
—Scientists still ________ explain exactly why people dream.
—That’s right. They might understand it all someday, but they aren’t sure now.
A.shouldn’t B.mustn’t C.needn’t D.can’t
The mountain trip is________than the lake expedition.
A.popular B.more popular C.most popular D.the most popular
Bones are important ________ they help us move freely.
A.so B.but C.because D.although
These people come ________ different countries. They are here to learn Chinese.
A.from B.on C.in D.for
Mr. Lin decided to take the lead.________called for everyone’s attention.
A.I B.He C.She D.They
