Living in the central American desert has its problems, ________ obtaining water is not the least .
A．of which B．for what C．as D．whose
---Alice, why didn’t you come the other day ? .
---I______, but I had an unexpected visitor.
A．had B．would C．was going D．did
----Please come in and make yourself___________.
----- Thank you ！
A．at sea B．at will C．at home D．at sight
The committee has recommended that the training program _______ improved .
A．would be B．is C．was D．be
We__________ an old man lying in the road, who was badly ill.
A．came along B．came by C．came across D．came up
Helping others is a habit, _____ you can learn even at an early age.
A．it B．that C．what D．one
