— Will 1000 dollars ______ the bill?

— Of course, more than sufficient.

A．cover            B．pay              C．contain           D．include

If you _____ the bottle and cigarettes, you we’ll be much healthier.

A．take off           B．keep off           C．get off            D．set off

It is often recommended that children _______ chances to get close to nature.

A．must be offered    B．should offer        C．be offered         D．are offered

He ______ be sitting at the gate, waiting for his lost son.

A．used to           B．was used to        C．could             D．was accustomed

The book was written in 1946, _______ the education system has witnessed great changes.

A．since then         B．when             C．since when        D．during which

After completing and signing it, please return the form to us in the envelope _______.

A．provided          B．providing          C．having provided    D．provide

He dressed up and went to the party as if ________.

A．was invited        B．had been invited    C．to be invited       D．invited

It is not always easy for the public to see _______ use a new invention can be of to human life.

A．whose            B．which            C．that              D．what

He _______ have taken your car by mistake because he didn’t have the keys.

A．mustn’t          B．shouldn’t        C．couldn’t         D．needn’t

Food supplies in the flood-stricken area _______. We must act immediately before there’s none left.

A．have run out       B．have been run out   C．are running out     D．are being run out