It is clear that a computer works _________ faster than an abacus．

a lot

a lot of

little

very

Tommy is _________ captain of the class team at school and he is also _________ member of _________ Senor High team．

/; a; the

the; the; the

the; a; the

/;/; the

_________ students up to 2, 000, the school has built another laboratory．

As

For

with

Since

Every possible means _________ to prevent the crash, but the computer doesn’t still work．

is used

are used

has been used

have been used

Having a trip abroad is certainly nice for the old couples, but it remains ________ whether they will enjoy it．

to be seen

to see

seeing

seen

The flowers ________ sweet in the botanic garden, which attracted the visitors to the beauty of nature．

to smell

smelled

smelling

are smelled

Happy birthday, Alice! So you have ________ 21 already．

gone

turned

grown

passed

On hearing the news of the accident in the coal mine, she ________ pale．

got

changes

went

appears

The teacher, with 6 girls and 8 boys of her class, ________ visiting a museum when the earthquake struck．

was

is

were

had been

The first use of atomic weapons was in 1945, and their power ________ increased enormously ever since．

is

was

has

had been