---How’s your tour around the North Lake? Is it beautiful?
---It ________ be, but it is now heavily polluted.
A. will B. would C. should D. must
I won’t call you, ________ something unexpected happens.
A. unless B. whether C. because D. while
---The last one __________________ pays the meal.
---Agreed!
A. arrived B. arrives C. to arrive D. arriving
---It’s a long time since I saw my sister.
---_______________ her this weekend?
A. Why not visit B. why not to visit
C. Why not visiting D. Why don’t visit
The manager suggested an earlier date ____________ the meeting.
A. on B. for C. about D. with
Scientists have many theories about how the universe ___ into being.
A. came B. was coming
C. had come D. would come
