Exercise 4

It is these poisonous products____ can cause the symptoms of the flu, such as headaches and aching muscles.
1. who
2. that
3. how
4. what
The discovery of new evidence led to____.
1. the thief having caught
2. catch the thief
3. the thief being caught
4. the thief to be caught
Only when your identity has been checked,____.
1. you are allowed in
2. you will be allowed in
3. will you allow in
4. will you be allowed in
Generally speaking,____ according to the directions, the drug has no side effects.
1. when taking
2. when taken
3. when to take
4. when to be taken
It is pretty well understood _____ controls the flow of carbon dioxide in and out of the atmosphere today.
1. that
2. when
3. what
4. how
I can think of many cases____students obviously knew a lot of English words and expressions but couldn't write a good essay.
1. why
2. which
3. as
4. where
A: Dad, I've finished my assignment.
B: Good, and ____ you play or watch TV, you mustn't disturb me.
1. whenever
2. whether
3. whatever
4. no matter
An army spokesman stressed that all the soldiers had been ordered ____ clear warnings before firing any shots.
1. to issue
2. being issued
3. to have issued
4. to be issued
We ________ last night, but we went to the concert instead.
1. must have studied
2. might study
3. should have studied
4. would study
It is generally considered unwise to give a child _____ he or she wants.
1. however
2. whatever
3. whichever
4. whenever