---It’s a wonderful party.—It’s very nice of you to come.___.
| A．Please do make yourself at home | B．Please enjoy yourself |
| C．Help yourself | D．Have a good time |
We hadsat down at the table, when the phone rang.
| A．possibly | B．hardly | C．virtually | D．politely |
--- What’s wrong with your car?
----It has atyre.
| A．spare | B．normal | C．smooth | D．flat |
---He is fifteen years younger than you.
---?
| A．How come | B．So what | C．How then | D．if so |
Although his experiments were designed to support the ideasthe influence of environment upon plants, Mendel found that many characteristics were passed on from one generation to the next.
| A．concerning | B．attaching to | C．involving in | D．concerning with |
They are experienced porter(搬运工)who know how tothe weight of the rocks they carry.
| A．spread | B．put | C．launch | D．take |