It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it.
| A．that | B．what | C．how | D．whether |
It is high time, I think, that you got down to ______ something in class.
| A．do | B．did | C．doing | D．does |
I've never seen a Shakespeare's play ______ so wonderfully.
| A．performing | B．performed | C．perform | D．is performing |
Tom's shoes looked just the same as Mike's, but they cost _______ his.
| A．as much twice | B．twice as much as | C．much as twice as | D．as twice much as |
Mother, together with her children , ______ to the hospital.
| A．were sent | B．are sent | C．was sent | D．have been sent |
The war made ______ impossible for the scientist to go on with his research.
| A．him | B．it | C．this | D．that |