It’s certainly been a long time ________ we met last time．

that

before

until

since

Unfortunately, the element Madam Curie devoted all her life ________ her death．

to caused

causing

to be caused

to causing

Out of the crowded bus ________, who was dressed in a black suit and waved to a woman．

a tall man stepped

stepped a tall man

did a tall man step

did a tall man stepped

With the help of high technology, in the past few years, electronic business ________ to bank industry, travel industry．

applied

have applied

had been applied

has been applied

We all know the truth ________ there are air, water and sunlight, there are living things．

in wherever

where

that where

that

Look at the mess the boys made! You ________ have taught them how to behave themselves．

must

may

can

should

________ I paid a visit to this scenic spot, I was deeply attracted by its beauty．

Firstly

For the first time

The first time

At first

________ has an interest in the lecture can go for a ticket from the office next to the gate of the lecture room．

No matter who

Whoever

Anyone

Those who

When the police arrived, the crowd made off ________ all directions．

in

to

at

for

Farming, ________ to human welfare, is now a small part of the economy of the country．

essential as it is

essential as is

it is essential

as essential