By the time Robert will finish writing the first draft of his paper, most of the other students will have completed their final draft.

A. will finish

B. writing 

C. most 

D. their 

What we know about certain diseases are still not sufficient to prevent them from spreading easily among the population.

A. What we know

B. are

C. from spreading

D. among

The grass needs cutting, so let us have one of the men to take lawn-mower and do it.

A. needs

B. cutting

C. let

D. to take

People in every part of the world readily and easily communicates by means of electronic mail.

A. every part

B. readlily

C. communicates

D. by means

Mrs. Stevens, along with her cousins from Canada, are planning to attend from wood, herbs and flowers and using them for perfumes or medicine.

A. man

B. sweet-smelling

C. using them

D. or

If one type of manufacturing expands, it is like that another type will shrink considerably.

A. expands

B. like

C. another

D. considerably

Mrs. Stevens, along with her cousins from Canada, are planning to attend the firework display in Da Nang, Vietnam.

A. with

B. her cousins

C. are

D. to attend

The longer the children waited in the long queue, the more impatiently they became. 

A. the longer

B. waited

C. the long queue

D. impatiently

Not until he got home he realized he had forgotten to give her the present.

A. got

B. he realized

C. her

D. the present

The earth is the only planet with a large number of oxygen in its atmosphere. 

A. the

B. number

C. oxygen

D. its