Chọn đáp án đúng:

1. Different conservation efforts have been made in order to save giant pandas...they were under greater threat

A. because      B. although        C. despite        D. because of

2. Health workers are at higher risk from a novel corona virus....they come into contact with patients more often than the general public

A. even though      B. in spite of        C. in that       D. because of

3. Some English words have the same pronunciation...they are spelled differently, for example dear and deer

A. unless         B. even if        C. even though       D. since

4. During the pandemic, patients were discharged from hospital...the beds were needed by those infected with the deadly virus

A. although       B. in spite of        C. because        D. because of

5. I don't believe Mary can do it,.....?

A. can she        B. can't she          C. does she         D. doesn't she

6. ....most of our present energy caomes from fossil fuels

A. the        B. 0         C. a         C. an

7. If you....your English every day, you'll speak it fluently

A. use        B. will use         C. used to        D. are used to

8. Dan....in the living room while we were decorating his bedroom

A. sleeps        B. was sleeping       C. had slept        D. have selpt

9. Have you...any serious relationships in the last year?

A. had         B. made        C. done        D. taken

10. I'm feeling a bit feverish - I hope I haven't...the flu

A. paid        B. caught        C. made     D. got

Bài 1: Hỗn hợp X gồm 0,2 mol axetilen và 0,35 mol H₂ vào bình kín có xúc tác Ni nung nóng. Sau một thời gian thu được hỗn hợp Y gồm 4 khí. Khi cho Y lội qua dung dịch Br₂ dư thấy có 4,48 lít (đktc) khí Z bay ra. Tỉ khối của Z so với H₂ là 4,5. Tính độ tăng khối lượng của bình brom

Bài 2: Hỗn hợp X gồm 0,2 mol C₂H₂ và 0,4 mol H₂ được chứa trong bình jins có sẵn bột Ni (thể tích không đáng kể). Đun nóng bình một thời gian thu được hỗn hợp khí Y (tỉ khối của Y so với H₂ là 6). Cho Y đi chậm qua dung dịch Br₂/CCl₄ dư thấy có m gam brom phản ứng. Tính m

Chon cau tra loi:

1. I had...little problem with my car, but it's been fixed now

A. the        B. a        C. an        D. some

2. Most of...international students have met their advisors, but a few of them have appointments next week

A. an        B. the         C. a        D. 0

3. Could you get me half...dozen eggs when you go to...supermarket?

A. a-the        B. a-an         C. a-a        D. the-the

4....great many people have joined the protest to voice their concerns over increased taxes

A. the         B. a         C. 0         D. an

5. This type of nursery care may well be...best choice for your child

A. a        B. an       C. 0        D. the

6.....surface temperature of....sun is around 6000 degrees C

A. a-the         B. a-an         C. the-the        D. the-a

7. He plays...guitar and sings folk songs

A. the       B. 0        C. a           D. an

8. He nibbled...piece of bread while drawing a picture

A. a         B. some         C. an         D. any

9....the rain has stopped, the field will dry out

A. even if          B. while          C. though         D. now that

10....so many of the team members were ill. it's not surprising that we lost the match

A. since         B. due to        C. nonetheless         D. in contrast

Chon dap an dung:

1. Why did you worry son much? I already told you I put up at Carol's

A. You shouldn't worry so much. I already told you I put up at Carol's

B. You needn't have worried so much. I already told you I put up at Carol's

C. You mustn't have worried so much. I already told you I put up at Carol's

D. You've needed not worried so much. I already told you I put up at Carol's

2. We booked seats but it was not necessary because there were plenty of rooms

A. We need not have booked seats because there were plenty of rooms

B. We need have not booked seats because there were plenty of rooms

C. We don't need to book seats because there were plenty of rooms

D. We didn't need have booked seats because there were plenty of rooms

3. It's such a shame you didn't keep your promise to Peter

A. You ought to keep your promise to Peter

B. You could have kept your promise to Peter

C. You ought to have kept your promise to Peter

D. You must have kept your promise Peter

4. Perhaps we missed the beginning of the show

A. We might have missed the beginning of the show

B. We might be missing the beginning of the show

C. We may miss the beginning of the show

D. We might miss the beginning of the show

5. I work out with my mom almost every day

A. Not a day goes by unless my working out with my mom

B. Hardly does a day go by without my working out with my mom

C. No day go by without my working out with my mom

D. Almost every day gose by without working out with my mom

6. I doubt very much that you saw me at the party as I'm in London at the moment

A. You couldn't have seen me at the party as I'm in London at the moment

B. You could have not seen me at the party as I'm in London at the moment

C. You cannot have seen me at the party as I'm in London at the moment

D. You can have not seen me at the party as I'm in London at the moment