The driver who died in the accident _________, but he didn’t wear the seat belt.A. could survived B. could have survivedB. must survived D. must have survived
Do you know the reason _______ he was late?
I’ll take you to the museum ______ you may see everything _________ you want.
Is oxygen the only gas ________ helps fire burn?
The number of the people present at the concert was _____ than expected. There were many tickets left.
The silk road, _______ Marco entered China, was important for the exchange of goods and ideas.