______visited the Shanghai World Expo is sure to tell you the place is worth visiting twice.
| A．Those who have | B．Whoever has |
| C．Those who has | D．Whoever have |
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 |