1)помогите пожалуйста : в арифметической прогрессии an, найти а101,если а12=20,5, а7=10,5
2)вычислите сумму 30+31+32+...+38+39+40

1) Mark the words that have 2 forms of plural

a) buffalo  

b) boyfriend

c) roof   

d) analysis

e) man  

f)  stratum  

g) groun -up 

h) antenna

i) cactus

j) scarf

2) Which suffix doesn’t change  the place of  the stress in the word

--- ous 

--- ment

--- ate

---- on

---- ics

3) Find the correct sentence

A) Bob has  been working at school for 5 years but he doesn’t  work there now.

B)  Bob has worked at school for 5 years and still works there .

C) Bob worked at school for 5  years and still works there.

D) Bob has worked at school for 5 years but he doesn’t  work there now.

E) Bob worked at school for 5  years and is still working there.

4) Arrange the sentences according to the  given order : strong obligation , prohibition ,  recommendation, offering , absence of obligation.

1) One must have a license to  drive a car.

2) Shall  I give you a helping hand .

3) You must not cross the street by the red light .

4) You should eat more fruit

5) You don’t have to go there.

5) Match the names and their meanings.

Chloe                     woman of wealth

Megan                    symbol of place

Jessica                    like good

Olivia                     blooming

Michael                  great

6)  The words which can be adj and adv

1) fortnightly                        6) goodly

2) yearly                                7) comely

3) lowly                                 8) elderly

4) deadly                               9)  silly

5) ugly

7) Find  the right form of  plural for the word a court martial

A) court martiales

B) courts martials

C) court martial

D) courts martial

E) court martials

8) The verbs are written with the suffix – ise both in British and American English .

A) generalize   B) organize   C) mechanize   D) baptize   E) improvise  F) criticize

G) comprise     H) realize      I)  despise