No one can predict the future exactly. Things may happen _______.
A.expectedly
B.expected
C.unexpected
D.unexpectedly

It is often a good idea to start with small, easily _______ goals.
A.achievement
B.achievable
C.achieve
D.achiever

Choose the best word/phrase to complete the sentences from 10 to 30.
Many teenagers show signs of anxiety and _______ when being asked about their future.
A.depressed
B.depressing
C.depression
D.depress

An economic _______ is a time when there is very little economic activity, which causes a lot of unemployment and poverty.
A.depression
B.development
C.mission
D.improvement

Someone who is _______ is hopeful about the future or the success of something in particular.
A.pessimistic
B.stagnant
C.optimistic
D.powerful

Can you make a ________ estimate of how much our expedition in the desert may be?
A.roughly
B.roughing
C.roughen
D.rough

More and more ________ are very excited at discovering as many interesting things in the deserts as possible.
A.explorers
B.explorations
C.exploratory
D.explores

You can see the details_________the computer screen.
A.in
B.at
C.on
D.by

Don't walk too fast. I can't keep_________
A.up with
B.on with
C.on to
D.up to

The Sahara contains complex linear dunes that are ________ by almost 6 kilometers.
A.located
B.developed
C.lay
D.separated