WORD FORM EXERCISE

1. Nuclear _______ is a must if the country wishes to widen its international trade relations. (ARM)

2. She performs all the duties ______ and is the helping hand of the boss (CONSCIENCE)

3. Despite his horrible mistake, he remained ________ and stubborn (APOLOGY)

4. What a shame. He came to the party _________ (ASK)

5. The toxic waste from that chemical factory is doing _________ harm to the surroundings (MEASURE)

WORD FORM EXERCISE

1. The death was caused by her taking _____ of sleeping pills. (DOSE)

2. The company plans to reform its inefficient and __________ offices. (STAFF)

3. Pregnant women are warned against soking as it is especially detrimental to _______ babies. (BEAR)

4. What disappoints me is that he is always ________ by failure (MOTIVATION)

5. Drivers are advised to stay in their vehicles even if trafic ________. (STATION)

WORD FORM EXERCISE

1. As our grandma grows older, she suffers from sleeplessness and has to use sleeping pills at _______ (TIME)

2. These experiments were carried out with _______ levels of success before being abandoned due to their unreliability. (VARY)

3. His stomach ache results from his having ________ meals (REGULARLY)

4. We tried, _____, to climb the mountain but the weather deteriorated quickly so we had to give up. (SUCCEED)

Cho : a là số tự nhiên có 61 chữ số 1

b là số tự nhiên có 68 chữ số 1

Chứng tỏ : \(ab-2⋮3\)