________ in black suits, and with instruments in hand, the musicians climbed onto the stage.

A．Dressing       B．Dressed        C．To be dressed D．To dress

Go straight into the cave and find out what's in there, ________?

A．can't you      B．don't you     C．are you         D．will you

All flights ________ because of the terrible weather, so we had to go there by train.

A．canceled                                                 B．were canceled

C．have canceled                                          D．have been canceled

The boat will not arrive ________ twenty hours.

A．for        B．at         C．in          D．by

—How long ________ you ________ in Beijing?

— For just the weekend．I'll be back next Monday morning.

A．have; stayed                                            B．do; stay

C．did; stay                                                 D．are; staying

A red lamp is often used as a danger ________.

A．gesture         B．signal    C．sign       D．information

—Whose car is that outside Bill's house?

—It ________ belong to Bill's sister．I heard that she's staying with him this week.

A．can       B．should          C．must    D．will

None of the underwater workers has been harmed by the great fish．________, most fish were so friendly that they played with the instruments.

A．Instead         B．Even though         C．However       D．Though

Alibaba has become China's largest online commercial company, ________ a profit of 1.36 billion yuan in 2006.

A．earns    B．earning         C．earned          D．to have earned

Furniture made of wood is certainly more expensive than ________ made of other materials.

A．it           B．one        C．those        D．that