19、_______worries me the way he keeps changing his mind.

A．This    B．That C．What   D．It

18、It’s the sort of work that _______a high level of concentration.

A．calls for   B．makes up   C．lies in     D．stands for

17、Please remain_______ until the plane has come to a complete stop.

A．to seal   B．to be seated   C．seating  D．seated

16、I can’t say which wine is best—it’s a (n)_______ of personal taste.

A．affair    B．event    C．matter    D．variety

15、I have offered to paint the house_______ a week’s accommodation.

A．in exchange for   B．with regard to   C．by means of   D．in place of

14、_______ I really don’t like art, I find his work impressive.

A．As      B．Since    C．If       D．While

13、---Where did you get to know her?

---It was on the farm_______ we worked.

A．that     B．there   C．which    D．where

12、It isn’t socially_______ for parents to leave children unattended at that age.

A．accessible B．adorable C．adaptable D．acceptable

11、They_______ two free tickets to Canada, otherwise they’d never have been able to afford to go.

A．had got   B．got C．have got   D．get

10、The country has already sent up three unmanned spacecraft, the most recent _______at the end of last March.

A．has been launched     B．having been launched    C．being launched   D．to be launched