Choose the correct answer a , b , c or d 

8. Sometimes I ... up the streets of my neighborhood for volunteer service .

A. clean B. am cleaning C. have cleaned D. will clean 

9. I live in New York , but I ... the Statue of Liberty . 

A. never visit B. have never visited C. never visited D. will never visit 

10. I ... my favourite song when I turned on the radio yesterday . 

A. hear B. heard C. am hearing D. will hear

Supply the correct forms of the given words to complete the sentences :

31.............. TVs will be very popular in the future .

32. Japan is the most ..... advanced country .

33. This software is very .... for online classes.

34. Mom says she will buy a new ..... tomorrow .

35. There are a lot of ..... between present schools and future ones .

Give the correct form of the verbs to complete the sentences :

1. I think people ( live )... on Mars someday .

2. ( you / ever live ) ... in a smart house ?

3. I ( show ) ... you the garden when it stops raining .

4. My son ( draw ) ... his future house at the moment .

5. People in the future ( not drive ) ... normal cars . They ( have ) ... flying cars .

6. Would you like ( live ) ... on the Moon ?

7. You never know what might ( happen ) ... in the future .

8. Robots will do around the house such as ( cook ) ... meals and ( clean )... the floors.

9. Gustave Eiffel ( design )... Eiffel Tower in 1889 .

10. Someone ( knock ) ... at the door . Can you see who it is ?

Complete the sentences with the correct form of the verb in brackets :                                        1. Which sports ... you ( play ) ...at the weekends ?                                                                       2. My brother (buy)...2 tickets for the table tennis match yesterday .                                               3. Last weekend I (play)...with the friends and we (have)...a very good time.                                 4. Nowadays many girls (like / do ) ...aerobics to keep fit .                                                              5. What time you ( arrive ) ... at the medium ?                                                                                  6. How often he (go / fish )...?                                                                                                          7. .......your team ( win ).... yesterday ?                                                                                            8. My sister ( play )....badminton twice a week . He ( do ) ... it on Saturday and Sunday .               9. Where ... you ( go ) ...on holiday last year ?                                                                                10. I ( cycle )....100 kilometers last week .                                                                                                      Giúp mik vs 

1 thuyền xuôi từ A đến B hết 32 phút . Còn 1 cụm bèo trôi từ A đến B 3 h 12 phút .
a] Tính vận tốc thực của thuyền 
b] Tính thời gian  thuyền ngược từ B về A
                                               giúp mình với mình đang cần gấp