[单项选择]They couldn't see a ________of hope that they would be saved by a passing ship.
A. grain
B. span
C. slice
D. gleam

[单项选择]The police couldn't see which ______ the car went.
A. path
B. way
C. side
D. road

[单项选择]They hope to see you again ______.
A. before long
B. long before
C. long ago
D. after long

[单项选择](There )was (too) much dust that we (couldn’t) see (what) was happening.
A. There
B. too
C. couldn’t
D. what

[单项选择]Jimmy couldn’t' t eat hard food for at least half a week as he had his wisdom tooth ______ today.
A. pulled
B. fragmented
C. extracted
D. picked

[单项选择]I could see a car in the distance, but I couldn't ______ what colour it was.
A. see through
B. make out
C. look out
D. take in

[单项选择]He couldn't______his curiosity to see what was in the box.
A. retain
B. restrain
C. restrict
D. represent

[单项选择]He couldn't ______ his curiosity to see what was in the box.
A. retain
B. restrain
C. restrict
D. represent

[单项选择]

For many years, scientists couldn’t figure out how atoms and molecules combined to make living things. Plants, fish, dinosaurs, and people are made of atoms and molecules, but they are put together in a more complicated way than the molecules in the primitive ocean. What’s more, living things have energy and can reproduce, while the chemicals on the Earth 4 billion years ago were lifeless.
After years of study, scientists figured out that living things, including human bodies, are basically made of amino acids, nucleotide bases, lipids and water. How could such complicated molecules have been formed and have started to interact in the primitive soup Scientists were stumped.
Then, in 1953, two scientists named Harold Urey and Stanley L. Miller did a very simple experiment to find out what had happened on the primitive Earth. They set up some tubes and bottles in a closed loop, and put in some of the same gases that were present in the atmosphere
A. 4 billion years ago.
B. After seven days.
C. Many years ago.
D. In 1953.