TOEFL Grammar exercise

Complete the following sentences using appropriate verb forms. Each question is followed by three suggested answers. Choose the most appropriate one.

Question 1

Houses in slums ………………………….. so tightly that there is no public access for service vehicles or open space.

a) crammed

b) are crammed

c) are cramming

Question 2

Some researchers claim that climate change will destroy our species; now it …………………………………. it also helped forge it.

a) seemed

b) seems

c) seem

Question 3

The rapid fluctuations in temperature that ……………………………….. the global climate between 2 and 3 million years ago coincided with a golden age in human evolution.

a) characterizing

b) characterize

c) characterized

Question 4

The classic survival traits of Homo Erectus, the first hominin to leave Africa, including teeth suited for generalized diets and a large brain.

a) including

b) included

c) were including

Question 5

A mathematical model that …………………………………… how a tumor will develop could help design treatments tailored to individual cancers.

a) predict

b) predicts

c) predicting

Answers

1. Houses in slums are crammed so tightly that there is no public access for service vehicles or open space.

2. Some researchers claim that climate change will destroy our species; now it seems it also helped forge it.

3. The rapid fluctuations in temperature that characterized the global climate between 2 and 3 million years ago coincided with a golden age in human evolution.

4. The classic survival traits of Homo Erectus, the first hominin to leave Africa, included teeth suited for generalized diets and a large brain.

5. A mathematical model that predicts how a tumor will develop could help design treatments tailored to individual cancers.