Experts say that pretend play deserves ______.

Experts say walking is one of the best ways for a person to ______ healthy.

A．preserve

B．stay

C．maintain

D．reserve

Experts say the space rock is probably ______ more than $30,000.

A．weighty

B．costly

C．valuable

D．worth

Leading stress management experts say that life with stress would be dull and ______.

A．disorderly

B．time-consuming

C．fruitless

D．unexciting

Some experts say water problems contributed to war in 1967 between ________.

A．Israel and Syria

B．Israel and Jordan

C．Israel and Palestine

D．Israel and Egypt

Public health experts say that (the) money one spends (avoiding) illness is (less) than the cost (to be) sick.

A．the

B．avoiding

C．less

D．to be

A、as a result

B、in result

C、a result of

D、a result

Google was invented lay experts in the 1980s.

A．Right

B．Wrong

C．Doesn't say

What do experts say about the earth's fuel reserves？

A．The earth's fuel reserves will be accessible for the next 50 years.

B．There will soon be an energy crisis.

C．Conventional reserves will soon become inaccessible.

D．Fuel demand will decline.

A．True

B．Fasle