From space, the earth looks blue. This is about seventy-one percent of its surface is covered by water.
A．why B．how C．because D．whether
It's an either-or situation - we can Buy a new car this year or we can go on holiday But we can’t do .
A．others B．either C．another D．Both
Four and half hours of discussion took us up to midnight,and Break for cheese,chocolate and tea with sugar.
A．a;a B．the; the C．不填；the D．a;不填
Only By increasing the numBer of doctors By 50 percent properly in this hospital.
A．can Be the patients B．can the patients Be treated
C．the patients can Be treated D．treated can Be the patients
A serious study of physics is impossible some knowledge of mathematics.
A．against B．Before C．Beyond D．Without
It was only after he had read the papers Mr. Gross realized the task Before him was extremely difficult to complete.
A．when B．that C．which D．What
