Jack wasn't saying anything, but the teacher smiled at him ________ he had done something very clever.

A．as if

B．in case

C．while

D．though

Only after they had discussed the matter for several hours ________ a decision.

A．they reached

B．did they reach

C．they reach

D．do they reach

Before a problem can be solved, it must be obvious ________ the problem itself is.

A．what

B．that

C．which

D．why

It is the most instructive lecture that ________ since I came to this school.

A．attended

B．had attended

C．am attending

D．have attended

Do you wake up every morning ________ energetic and ready day?

A．fcel

B．tofeel

C．feling

D．fell

No noe ________ be compored with Yao ming in playing baskctball

A．can

B．need

C．must

D．might

In 1942 Columbus ________ on the of the Bahama islands, but he mistook it for an island of India.

A．lands

B．landed

C．has landed

D．had landed

One-third of the contry ________ covered with trees and the majority of the citizens _______ black people.

A．is are

B．is is

C．are are

D．are is

Julic was good at German French and Russian all of ________ she spoke fluently

A．who

B．whom

C．which

D．that

I know that ________ would over discourage hin he would necer give up to be a director

A．something

B．anything

C．everything

D．nothing