1. Mary doesn’t know the way to her best friend’s house.
Mary wishes..............
2. When did you first know this bamboo forest?
How long.......................
3. I often wore jeans when I was young.
I used .............
4. It’s time for you to go to school.
It’s time you ....................
5. The last time I met Mariam was 2 months ago.
I haven’t .......................
1. I ………………………Tom since he got married. (not / see)
2. How long is it since she last ……………………………….you? (see)
3. I didn’t use ………………………him, but we’re good friends. (like)
4. She ………………………………as a musician for five months now. (work) 5. I’ve known Jill since she …………………………seven. (be)
1. I think it’s …………………………………………….for students to wear uniforms going to school. (NEED)
2. Many ………………………………..want to change the traditional ao dai. (DESIGN)
3. The baby slept ………………………………………….last night. (PEACE) 4. English is a …………………………………..second language in my country. (COMPEL)
5. English, Chinese and Tamil are ……………………….spoken in Malaysia. (WIDEN)
1. Lan and her pen pal Maryam ………………….with each other for two years now.
A. correspond B. are corresponding C. have corresponded D. were corresponding
2. They ……………………a sightseeing tour of the city when Maryam was there.
A. Had B. have had C. have D. will have
3. “How many countries……………………up to now? “Three countries”
A. do you visit B. have you visited C. are you visiting D. did you visit
4. Malaysia is ………………into two regions: West Malaysia and East Malaysia.
A. comprised B. divided C. consisted D. contained
5. I have had a very good time with you. I wish I …………have to say goodbye to you now!
A. don’t B. won’t C. weren’t D. didn’t
Trung hoà 20 ml dung dịch H2SO4 1M bằng dung dịch Ba(OH)2 6%.
a) Tính khối lượng kết tủa thu được.
b) Tính khối lượng dung dịch Ba(OH)2 6% đã dùng.
Cho H =1, S =32, Ba =137, O =16
Gợi ý công thức liên quan: CM = n/V và C% = mct.100%/mdd