When a giraffe has _____ drink, it has to stand with its front legs wide apart in order to reach _____ water easily.

A．不填；不填       B．a; the             C．the; 不填         D．不填；the

The main reason why Apple’s products always manage to capture the imagination of people worldwide is their attention to _____. Each and every part of an Apple product is perfect in its body.

A．details            B．functions          C．features          D．trends

 Encouraged by my science teacher, I set about my studies on developing my product, _____I hope I will succeed in applying for a patent（专利）.

A．with whom        B．to whom          C．through which      D．for which

He is only too ready to help others, seldom, ____, refusing them when they turn to him.

A．if never           B．if ever            C．if not             D．if any

--- The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?

---____ my students have a try?

A．Shall             B．Must             C．Will              D．May

We had a really bad time about six months ago but now things are ____.

A．looking up         B．coming up         C．making up         D．turning up

___ the temperature might drop, coal was prepared for warming.

A．To consider        B．Considered        C．Considering        D．To be considered

Many strange new means of transport have been developed in our century, the strangest of _____ being perhaps the hovercraft(气垫船).

A．which            B．them             C．that              D．it

It’s already 10’clock. I wonder how it ____ that she was two hours late on such a short trip.

A．came over         B．came out          C．came about        D．came up

 The sunspot came into its active stage, __________ that happens once every eleven years.

A．one              B．it                C．the one           D．what