__________ a certain doubt among the people as to the practical value of the project.
| A．It has |
| B．They have |
| C．It remains |
| D．There remains |
----The cake smells delicious.
---- ____.
| A．So does it | B．So it does | C．So is the cake | D．So it is |
----It's too late now. I think it's time for me to leave.
---- ____.
| A．Good idea | B．Good night | C．Good evening | D．Really |
Is this school ____ you studied at ten years ago?
| A．which | B．that | C．where | D．the one |
What the boy ____ make his friends happy.
| A．does did | B．did did | C．do do | D．do does |
He was so pleased with all ______ we had done for him _____ he wrote us a letter to praise us for it.
| A．what; what | B．what; that | C．that; what | D．that; that |