They had planed to _______ the building but the bomb failed to _______．

bomb; set off

explode; bomb

bomb; explode

set off; explode

Not all these _______ songs are _______ ones;some of them have been sung for ages．

popular; current

current; popular

popular; popular

current; current

While shopping, people sometimes can’t help _______ into buying something they don’t really need．

to persuaded

persuading

being persuaded

be persuaded

See the flags on top of the building? That was _______ we did this morning．

when

which

where

what

We were swimming in the lake _______ suddenly the storm started．

when

while

until

before

I have been looking forward to _______ you since I send you a letter last summer．

hear

hear from

hearing

hearing from

It’s no use _______ so much money on clothes．

spend

spent

spending

being spent

Seeing his mother, the baby could not help _______．

to laugh

laugh

laughing

laughed

_______ the news, he said nothing and went away．

After being told

Although being told

While being told

Being told

Writing stories and articles _______ what I enjoy most．

is

are

was

were